Higher Corrosion Rate Research Articles

Sulfate-dependant microbially induced corrosion of mild steel in the deep sea: a 10-year microbiome study

BackgroundMetal corrosion in seawater has been extensively studied in surface and shallow waters. However, infrastructure is increasingly being installed in deep-sea environments, where extremes of temperature, salinity, and high hydrostatic pressure increase the costs and logistical challenges associated with monitoring corrosion. Moreover, there is currently only a rudimentary understanding of the role of microbially induced corrosion, which has rarely been studied in the deep-sea. We report here an integrative study of the biofilms growing on the surface of corroding mooring chain links that had been deployed for 10 years at ~2 km depth and developed a model of microbially induced corrosion based on flux-balance analysis.MethodsWe used optical emission spectrometry to analyze the chemical composition of the mooring chain and energy-dispersive X-ray spectrometry coupled with scanning electron microscopy to identify corrosion products and ultrastructural features. The taxonomic structure of the microbiome was determined using shotgun metagenomics and was confirmed by 16S amplicon analysis and quantitative PCR of the dsrB gene. The functional capacity was further analyzed by generating binned, genomic assemblies and performing flux-balance analysis on the metabolism of the dominant taxa.ResultsThe surface of the chain links showed intensive and localized corrosion with structural features typical of microbially induced corrosion. The microbiome on the links differed considerably from that of the surrounding sediment, suggesting selection for specific metal-corroding biofilms dominated by sulfur-cycling bacteria. The core metabolism of the microbiome was reconstructed to generate a mechanistic model that combines biotic and abiotic corrosion. Based on this metabolic model, we propose that sulfate reduction and sulfur disproportionation might play key roles in deep-sea corrosion.ConclusionsThe corrosion rate observed was higher than what could be expected from abiotic corrosion mechanisms under these environmental conditions. High corrosion rate and the form of corrosion (deep pitting) suggest that the corrosion of the chain links was driven by both abiotic and biotic processes. We posit that the corrosion is driven by deep-sea sulfur-cycling microorganisms which may gain energy by accelerating the reaction between metallic iron and elemental sulfur. The results of this field study provide important new insights on the ecophysiology of the corrosion process in the deep sea.

In Situ Investigation of Under-Deposit Microbial Corrosion and its Inhibition Using a Multi-Electrode Array System.

Carbon steel pipelines used in the oil and gas industry can be susceptible to the combined presence of deposits and microorganisms, which can result in a complex phenomenon, recently termed under-deposit microbial corrosion (UDMC). UDMC and its inhibition in CO2 ambiance were investigated in real-time using a multi-electrode array (MEA) system and surface profilometry analysis. Maps from corrosion rates, galvanic currents, and corrosion potentials recorded at each microelectrode allowed the visualization of local corrosion events on the steel surface. A marine bacterium Enterobacter roggenkampii, an iron-oxidizing, nitrate-reducing microorganism, generated iron deposits on the surface that resulted in pitting corrosion under anaerobic conditions. Areas under deposits displayed anodic behavior, more negative potentials, higher corrosion rates, and pitting compared to areas outside deposits. In the presence of the organic film-forming corrosion inhibitor, 2-Mercaptopyrimidine, the marine bacterium induced local breakdown of the protective inhibitor film and subsequent pitting corrosion of carbon steel. The ability of the MEA system to locally measure self-corrosion processes, galvanic effects and, corrosion potentials across the surface demonstrated its suitability to detect, evaluate and monitor the UDMC process as well as the efficiency of corrosion inhibitors to prevent this corrosion phenomenon. This research highlights the importance of incorporating the microbial component to corrosion inhibitors evaluation to ensure chemical effectiveness in the likely scenario of deposit formation and microbial contamination in oil and gas production equipment.

Investigation of corrosion behavior of welded area of austenitic stainless steel under different environments

Stainless steel 316 has excellent corrosion resistance when exposed to different corrosive environments and medium. It is usually regarded as marine grade stainless steel and it is not resistant to the warm sea water. The corrosion behavior of welded austenitic chromium-nickel stainless steel was investigated with different welding process under different solutions or different environments. The corrosion loss measured by the weight loss method, optical microscopy and scanning electron microscopy. Austenitic stainless steel was welded by the Arc welding, MIG welding and TIG welding and these weld specimens were investigated by using three different acids which has highly corrosive properties such as Ferric chloride(FeCl3), Oxalic acid, Nitric acid (HNO3). These acids are taken as 1 N concentration for rapid corrosive. The weight loss was measured by 24 h once for 12 days. The micro structure of stainless steel was captured by optical microscopy and scanning electron microscopy and the lowest and highest rate of corrosion was observed.

Corrosion resistance evaluation of carbon and vanadium-based sputtered coatings on steel substrates

Steels are in constant contact with fluids that could generate corrosion regardless the application in which this steel is located. AISI-SAE 1045 like steels is widely used in different applications in engineering, even several of these parts made of this steel suffers wear processes. The synergy between corrosion and wear phenomena exacerbates the detriment of some physical properties of the material conducing it to a failure. A potential alternative to avoid this issue is to coat the material surface with an anticorrosive material, and among different techniques to produce coatings, physical vapor deposition ones are environmentally friendly, secure and with excellent properties on the final product. We report the production of coatings based on vanadium and carbon on AISI-SAE 1045 steels substrates varying some of the deposition parameters in a sputtering coatings machine. A 23-factorial design of experiments was done with power applied to the vanadium target, power applied to the carbon target and temperature as active factors with two levels each one. A relevant effect of the power applied to V target and temperature on the anticorrosive properties of the coatings was found, thus increasing these factors levels always gives higher surface roughness and higher corrosion rates, this result together provides an important insight into the values that must be considered to achieve good anticorrosive properties on the material. Overall, these results indicate that with low V target power and room temperature, and high C target power the lowest corrosion rates and roughness of the group are achieved, both results agree.

Comparison study of rust layers formed on Q420 and weathering steel after 6 years of exposure in marine atmospheres

In this study, the corrosion products formed on Q420 and weathering steel (WS) after 6 years of exposure in marine atmospheres in Pingtan, Fujian Province in China was examined. The evolution of the rust layers in terms of surface and cross-sectional morphologies were observed by SEM, while the consisted phases on the Q420 and WS were detected by XRD. The protective effect of the rust layers on the steels was studied by the electrochemical tests. The results of weight loss indicated that the Q420 had a relatively higher corrosion rate than that of the WS steel. The SEM observation showed that the WS steel could form a relative compact with fewer cracks after a long time of exposure concerning the Q420 steel. The electrochemical tests suggested the rust layer formed in the initial stage for the Q420 steel showed a better protective effect than that one formed at a later stage, whereas a better protective effect of the rust layer was formed at the later stage for the WS steels.

Two-dimensional lamellar polyimide/cardanol-based benzoxazine copper polymer composite coatings with excellent anti-corrosion performance.

The economic loss and environmental damage caused by metal corrosion is irreversible. Thus, effective methods, such as coating technologies are used to protect metal surfaces from corrosion. In this work, cardanol-based benzoxazine (CB) was synthesized by a solvent-free method using cardanol, paraformaldehyde and n-octylamine. A cardanol-based benzoxazine copper polymer (CBCP) with good mechanical properties was then prepared by CuCl2 catalysis and can be cured at room temperature. Subsequently, polyimide corrosion inhibitors with a two-dimensional sheet structure (pyromellitic dianhydride polyimide (PDPI) and 1,4,5,8-naphthalene tetracarboxylic dianhydride polyimide (NDPI)) were designed and prepared. Lastly, PDPI or NDPI was mixed with CBCP to obtain two-dimensional lamellar polyimide/cardanol-based benzoxazine copper polymer composite coatings. The Tafel curves and electrochemical impedance spectroscopy (EIS) measurements showed composite coatings with good corrosion resistance in different corrosive media. Compared to CBCP coating, the anticorrosion performance of the composite coatings improved obviously, especially the coating obtained with 0.5 wt% PDPI. It exhibits a high polarization resistance (3.874 × 109 Ω), a high protection efficiency (99.99% and 97.98%) and low corrosion rate (3.376 × 10−6 mm year−1). This work suggested a facile and eco-friendly strategy for preparing bio-based anticorrosive composite coatings from low cost and abundant cardanol and polyimide corrosion inhibitors, which will significantly promote their application in metal anticorrosion.

A study on corrosion behaviour of various modes of ATIG welded plain carbon steel

The purpose of this study is to look at the corrosion behaviour of various current modes of Autogenous Tungsten Inert Gas (ATIG) welded powder metallurgy plain carbon steel (Fe-0.5% C). The impacts of different current modes (DC, AC, Mixed, and Pulsed) on ATIG corrosion welded joints are looked at. To get the highest density, the rectangular sintered plain carbon steel strips were subjected to a cold upset. The parent and welded specimens were subjected to aqueous immersion and electrochemical corrosion tests. The corrosion test findings were compared to the microhardness, corroded surface morphology, microstructure, and SEM of the corroded area. It is observed from the test results that as the parent metal contains pores could lead to a high corrosion rate and the ATIG welded specimens exhibit less corrosion rate due to pore free region at the weldment. The DC mode of the welded specimen is observed to exhibit a lesser corrosion rate compared to the other modes of welded specimens due to higher heat generation.

A new generation of highly customized Mg alloy-based implants

In the last years, the precision and personalized medicine is pushing the biomedical research efforts towards the direction of implant surgery requiring only 1-step approach: this goal has been achieved after the introduction of resorbable implants. The resorbable prosthetic support is indicated for temporary prosthetic applications, such as bone fractures fixation, or all those conditions usually treated with metal implants then removed with a second surgery, just after the healing of the bone defect. Biodegradable, bioactive and customizable implants for the treatment of bone fractures, both efficient in bearing the functional loads, and showing good biocompatibility and degradation properties matching the bone tissue healing, are still lacking. These premises have led to consider Magnesium (Mg) and its alloys as very promising candidates for the development of temporary, resorbable implants. However, the very high corrosion rate of Mg is the main problem, not yet solved. The material needs to be properly treated/coated, as well as manufactured, in order to design the most suitable duration of the temporary prosthesis permanence in situ. An innovative and interdisciplinary approach has been developed within the M. Era-Net ISIDE project and it is here briefly detailed with a special focus on the highlighted application fields.

Texture evolution and corrosion behaviour of Sn–1.5 wt% Cr coatings containing Graphene oxide

ABSTRACT Sn–1.5 wt% Cr coating incorporated with varying quantity of Graphene oxide (GO) were deposited using electrodeposition technique on mild steel strip using aqueous electrolyte bath. The aqueous bath was dispersed with GO with increasing concentrations in mg/L (31.2, 62.5, 93.7, 125 and 156.2). All the coatings exhibited compact morphology and contained Sn and Cr-oxide phases (CrO2 and Cr2O3). Potentiodynamic polarisation and impedance spectroscopy techniques showed that the coating corrosion resistance increased for the initial addition of GO till Sn–Cr–GO2 coating (from 62.5 mg/L of GO) and it decreased thereafter for higher GO additions. The corrosion current density value exhibited by pristine Sn–Cr, Sn–Cr–GO2 and Sn–Cr–GO5 (from 156.2 mg/L of GO) was 1.38, 0.5 and 4.09 µA/cm2, respectively. Characterisation of the coating texture showed that between all the coatings, low angle grain boundary fraction was highest for Sn–Cr–GO2 coatings. The highest corrosion resistance was on account of special impermeable and inert properties of GO which was uniformly distributed in the coating matrix and the presence of a large fraction of low energy low angle grain boundaries. High corrosion rate in the case of Sn–Cr–GO5 coatings was attributed to the agglomeration of GO in the coating matrix which resulted in non-uniform coating morphology with high surface defects.

MEDIUM FOR LOCAL CO2-CORROSION LABORATORY TESTING

The results of laboratory experiments are presented, in which the essential features of corrosion processes occurring in real oilfield systems are simulated, namely, a high rate of local corrosion, exceeding the corrosion rate by 2…9 times. A standard environment and conditions for laboratory experiments are proposed, which make it possible to reproduce visible and measured with a needle micrometer (> 0,01 mm) local corrosion damage on coupons of corrosion control by the gravimetric method. The protective effect of corrosion inhibitors in relation to local carbon dioxide corrosion at the selected dosage is proposed to be assessed not by the magnitude of the protective effect, but by the presence or absence of local corrosion on the coupons of corrosion control by the gravimetric method after the end of the test. It is shown that with a high protective effect of corrosion inhibitors in relation to corrosion rate, there may be no protective effect in relation to local corrosion.

Electrodeposition of nano-Cu, Ni and binary Ni/Cu into nano-porous AAO layer for high-efficiency black spectrally selective coating

BackgroundAnodic aluminum oxide (AAO) template is widespread due to its diverse metal nanostructures. Various solar selective black coatings on aluminum oxide template were investigated. Spectrally selective nano-coating of nickel, copper and nickel–copper on anodized aluminum was produced.ResultsThe coatings were performed via electrodeposition and evaluated by measurement of coating thickness, hardness and optical properties. Also, these coatings were analyzed by scanning electron microscope, energy-dispersive X-ray spectroscopic and polarization studies in 3.5% NaCl solution. The anodized aluminum showed higher corrosion resistance (4.8284 KΩ) and lower corrosion rate (0.02189 mm/year). However, the electro-colored Al with Cu for 60 min showed the highest corrosion rate of 0.1942 mm/y, compared with other Al samples. The effect of anodizing time on the metal density and the optical efficiency of black copper coating was studied.ResultsThe obtained solar panels exhibit low values of solar reflectance within the visible range and high solar absorption efficiency. These coatings are highly efficient and adequate for any solar system.

Electrochemical study of iron deposit in acid media for its recovery from spent pickling baths regeneration

• Fundamental study of iron electro-deposit from a model pickling bath carried out. • The effect of Fe 2+ concentration on electrochemical iron deposition was analyzed. • Tafel analysis showed redissolution of metallic Fe even at cathodic potentials. • Rotating disk electrode studies evidenced intermediate kinetics for the Fe deposit. • For Fe reduction electrolysis tests, the removal was until t = 400 s. Electrochemical technologies for the regeneration of spent pickling baths are feasible since they allow simultaneous metal deposition and acid production in the same process unit. In this work, the effect of Fe 2+ concentrations on the electrochemical iron deposition from aqueous model sulfate electrolytes (representing spent pickling baths) is analyzed by voltammetry switching potentials, Tafel analysis, and spectroelectrochemistry studies. The research showed that the electrodeposition rate and potential decreased as Fe 2+ concentration increased according to cyclic voltammetry tests. Moreover, at higher Fe 2+ concentrations, a decrease in the hydrogen evolution reaction was observed. Also, chemical Fe dissolution is present at all concentrations studied, due to the high corrosion rate of iron at the low pH of the model bath as was showed by voltammetry and Tafel plots analysis. Thermodynamic diagrams and electrochemical tests coupled to UV–VIS spectroelectrochemical analysis demonstrated the presence of iron sulfate complexes that are involved in the main electrochemical reaction.

On the corrosion, stress corrosion and cytocompatibility performances of ALD TiO2 and ZrO2 coated magnesium alloys

Magnesium alloys are increasingly studied as materials for temporary implants. However, their high corrosion rate and susceptibility to corrosion-assisted cracking phenomena, such as stress corrosion cracking (SCC), continue to prevent their mainstream use. Recently, coatings have been considered to provide an effective solution to these issues and researchers have focused their attention on Atomic Layer Deposition (ALD). ALD stands out as a coating technology due to the outstanding film conformality and density achievable, and has shown encouraging preliminary results in terms of reduced corrosion rate and reduced SCC susceptibility. Here, we contribute to the ongoing interest in ALD-coated Mg alloys, providing a comprehensive characterisation of the effect of 100 nm thick ALD TiO2 and ZrO2 coatings on the corrosion behaviour and SCC susceptibility of AZ31 alloy. Moreover, we also investigate the effect of these coatings on the induced biological response. Our results suggest that the ALD coatings can improve the corrosion and SCC resistance of the Mg alloy, with the ZrO2 ALD coating showing the best improvements. We suggest that the different corrosion behaviours are the cause of the cytocompatibility results (only the ZrO2 ALD coating was found to meet the demands for cellular applications). Finally, we leverage on considerations about the coatings’ wettability, electrochemical stability and surface integrity to justify the different results.

Electrochemical Control for Corrosion in Molten Chloride Salts

Concentrated solar power (CSP) with thermal energy storage (TES) has the ability to help solve the renewable energy grid integration challenge with its electricity dispatch capability. However, utility-scale adaption of CSP-TES has been slow due to the high levelized cost of electricity (LCOE). One avenue for cost reduction is the increase in operating temperature of the CSP plant to increase the thermal efficiency of the Carnot cycle. This requires finding a new salt blend with higher thermal stability up to 800 ℃. A ternary MgNaK chloride salt is a prime candidate with its low cost, high thermal stability, and good heat transfer properties. However, its commercial deployment is challenged by the high corrosion rates, leading to the use of expensive alloys; thus, increasing the capital cost and maintenance cost of the CSP plant.A corrosion control system in MgNaK chloride salts using active metals such as Mg has been demonstrated under laboratory conditions. This mitigation strategy involves controlling the corrosive impurities, such as MgOHCl, by using liquid Mg. The elemental Mg scavenges oxygen and water derived impurities and provides redox reaction control by shifting the electrochemical potential of the alloys towards cathodic protection while Mg acts as the sacrificial oxidant. However, employment of Mg is challenged in the cold temperature section of the CSP plant (400 – 550 ℃) due to its slow dissolution kinetics in the solid state (melting point of 650 ℃).Here, we propose an electrochemical approach using bulk Mg anodes and W cathodes to provide corrosion control. We used electrolysis to enhance dissolution kinetics of solid Mg to the molten salt at temperatures relevant to the cold section of the CSP plant (500 ℃). Our data suggests electrolysis of Mg effectively enhances the rates of removal of corrosive impurities from molten chloride salts. Preliminary results indicate significant opportunity for the electrochemical process to be scaled up commercially. The novel approach eliminates impurities in-situ from oxygen and moisture ingress in the CSP plant, in turn reducing corrosion rates and therefore reducing capital and maintenance cost of the CSP plant.

Mechanical and electrochemical properties of friction stir processed magnesium alloy AZ31 for biomedical applications: A pilot study

Although having suitable mechanical properties, the high corrosion and resorption rate of biocompatible Mg alloys make them unsuitable for implant applications. Reducing the corrosion rate of the alloys by altering the metallurgical properties can be potentially beneficial for such applications. Friction stir processing (FSP) is an established process to induce changes in the surface microstructure of metals, and in this study, this process has been explored as a potential method to modify the metallurgical microstructure of the alloy. There is an increase of 13 % of microhardness and there is a 21 % reduction in ultimate stress in exchange of 15 % increase in % elongation in friction stir processed AZ31 magnesium alloy. The results indicate that the induced changes in the metallurgical microstructure by FSP process can augment the resistance to corrosion without significantly deteriorating the mechanical properties as observed from tests conducted in a simulated biological environment. Further experimentation is required to optimize the processing condition and establish the relationship between the evolved metallurgical microstructures and the mechanical and electrochemical properties.

STUDY ON ALTERNATE IMMERSION CORROSION BEHAVIOR AND MECHANISM OF SDCM DIE STEEL FOR HOT STAMPING

In this paper, the alternate immersion corrosion test of Cr-Mo-V series SDCM steel for hot stamping was carried out, and different stresses were loaded with self-made fixture. The results shown that regardless of hardness and stress, the corrosion mode of the material is uniform corrosion. Stress could significantly increase the corrosion rate, with lower hardness and higher corrosion rate. Because of the existence of Corrosion Removal Layer (CRL), the maximum corrosion pit depth would be reduced. The maximum corrosion pit depth and Corrosion Pit density (CPD, ρv) were used to describe the degree of corrosion damage. From low to high hardness, the CPD ρv and corrosion resistance increased gradually. With the increased of tempering temperature, the hardness decreased, and the percentage of carbide area in the field of view increased from 16.36% to 24.32%. The irregular spherical carbide M23(C, N)6 rich in Cr coarsens and consumes Cr element in the material, which lead to the decrease of corrosion resistance. Through the polarization curve of the dynamic potential, we known that the current density was increased with the hardness decreased, from 28.53 μA/mm2 to 40.93 μA/mm2.

Corrosive Effect of Tomato, Pepper and Onion Pulps on Selected Grinding Machine Components

As a result of cost considerations, local grinding machine manufacturing outfits are employing non-stainless-steel components for equipment fabrication. Despite the fact that the components are known to corrode, the number of the manufacturing outfits has increased over the years. Corrosion is a major concern to the food industry because the ingestion of corroded metals can harm and affect the function of some body organs. Potentiodynamic polarization method and a weight loss approach at room temperature was used to investigate the influence of tomato, pepper, and onion pulps on the electrochemical characteristics and weight loss of mild, galvanized, and stainless steel over a period of 30 days, at 5-day intervals. The results revealed that highest corrosion rate was found in mild steel (2.95x10-8mm/y) but low compared to the corrosion value obtained for galvanized steel (3.4x10-8mm/y) in the hybrid medium. Consequently, the use of mild steel as a substitute for stainless steel is suggested, provided that it is coated, and that the machine is cleaned regularly to remove residues from the metal surface or to inhibit microbiologically induced corrosion.

Mitsubishi Chemical is licensing the HydroPRS process of Mura Technology

In this chapter, the interaction of aqueous solutions with the materials of the experimental or production plants is discussed that can lead to major problems due to corrosion. The aqueous solutions contain many reactive compounds, for example, chloride ions, under oxidative or reductive conditions, that can cause corrosion. Corrosion includes all reactions of components of an aqueous reaction mixture with the walls of the equipment of experimental or production facilities, like pipes, valves, fittings, and autoclaves.Corrosion in hydrothermal and supercritical water processes depends on the properties of the reaction mixture, on the properties of the construction materials, and on the construction of the processing equipment. In general, no satisfying solution to corrosion problems can be achieved with addressing only one aspect. On the contrary, only a comprehensive adjustment of all aspects influencing corrosion can lead to a process configuration that can be operated successfully and for a reasonable extended time span.Various types of corrosion occur, such as general corrosion, intergranular corrosion, pitting corrosion, and stress corrosion cracking. General corrosion occurs mainly in the near critical and supercritical temperature range in a region, where the density is high. Corrosion rates below T = 320 °C are very low. At temperatures T > 320 °C and pressures higher than the critical pressure, corrosion rates increase considerably. At a pressure of P = 24 MPa, high corrosion rates drop down to the level observed at lower temperatures just around the critical temperature of water, while at a pressure of P = 38 MPa, corrosion rates remain high up to a temperature of about T = 450 °C, since at that temperature density reaches the limit for corrosion due to ionic processes.In this chapter, first corrosion phenomena are described as occurring in high-temperature aqueous systems. Then, the parameters influencing corrosion are discussed in some detail together with corrosion mechanisms. The effect of corrosion is illustrated by reporting on a number of detailed investigations on corrosion in aqueous systems. A detailed discussion of measures that can be used against corrosion follows and shows the necessity of combining several approaches and ends in a compilation of means against corrosion.

Corrosion Behavior of AlFeCrCoNiZrx High-Entropy Alloys in 0.5 M Sulfuric Acid Solution

AlCoCrFeNiZrx (x = 0, 0.1, 0.2, 0.3, and 0.5) high-entropy alloys (HEAs) were prepared by a non-consumable vacuum arc melting technology, and the microstructure and corrosion behavior were investigated by XRD, SEM, immersion tests, and electrochemical measurements. The results indicate that galvanic corrosion of the AlCoCrFeNiZrx alloys occurred in 0.5 M H2SO4 solution, and only 0.1 mol of the added Zr could greatly improve the corrosion resistance of the alloys. The corrosion properties of the AlCoCrFeNiZrx HEAs had similar change tendencies with the increase in the Zr content in the immersion tests, potentiodynamic polarization measurements, and electrochemical impedance analysis, that is, the corrosion resistance of the AlCoCrFeNiZrx alloys in a 0.5 M H2SO4 solution first increased and then decreased with the increase in the Zr content. The Zr0.1 alloys were found to have the best selective corrosion and general corrosion resistance with the smallest corrosion rate, whereas the Zr0.3 alloys presented the worst selective corrosion and general corrosion resistance with the highest corrosion rate from both the immersion tests and the potentiodynamic polarization measurements.

EFFECT OF FLOW RATE AND TEMPERATURE ON CORROSION RATE OF CARBON STEEL PIPE IN CONDENSATE SOLUTION FROM GEOTHERMAL POWER PLANT

The research aims to study the effect of flow rate and temperature on corrosion rate of carbon steel pipe in condensate solution from geothermal power plant. The corrosion rate in this study highlighted by electrochemical measurement. Electrochemical measurement performed in two conditions i.e stagnant and dynamic conditions. There are three kinds of temperature used in this research : 30oC, 40oC, and 50oC. Modification of corrosion cell installed for dynamic condition with flow rate variations : 0.27 m/s; 0.6 m/s; 1 m/s; 1.5 m/s; and 1.9 m/s. It was found that corrosion rate boosts with temperature and fluid flow rate in condensate solution of geothermal power plant. The highest corrosion rate (38 mpy) obtained at 50oC and 1.9 m/s of flow rate.