Surface Of Q235 Steel Research Articles

Anti-Corrosion and Wave-Absorbing Properties of Epoxy-Based Coatings on Q235 Steel

Carbon nanotube/epoxy resin (CNE) coatings and carbon nanotube/carboxy iron powder/epoxy resin (CIE) coatings were applied on the surface of Q235 steel, and their corrosion, absorption properties and other characteristics were measured in this work. The results indicate that the average thickness of a single application was approximately 400 μm, and the surface of the CNE coating was still smooth and intact after a 3000 h copper ion accelerated salt spray test without bubbles, falling off or other corrosion phenomena. The same was true for 28 days of full immersion in solutions of 10% hydrochloric acid (HCl) and 10% sodium hydroxide (NaOH) of the coating. The electrochemical testing exhibited the corrosion current of the CNE coating as being markedly lower than that of Q235 steel, with a protection efficiency of 81.68% for the Q235 steel. The CNE-0.6 coating had the maximum corrosion voltage (−0.390 V), and the CNE-0.3 coating had the minimum corrosion current of 2.07 × 10−6 A·cm2. The adhesion between the coating and Q235 could reach level 0, and the tensile strength of the coating was up to 18.75 MPa. The coating was observed to remain intact and free from detachment upon undergoing a drop test from a height of 50 cm. In addition, the CIE-0.6 coating exhibited an effective absorption band of 9.1 GHz, covering the range from 8.2 to 13.7 GHz, and it achieved a maximum reflection loss of −15.1 dB at a frequency of 8.6 GHz.

Synthesis of MnFe2O4 Spinel on Rusted Q235 Steel Surface and Its Corrosion Resistance Properties.

Corrosion of steel is an issue that cannot be ignored in contemporary society. Due to large-scale corrosion, it is urgent to develop a surface treatment process that enhances the corrosion resistance of steel, allowing for application in various scenarios as needed. This study aims to investigate a novel surface treatment process to extend the service life of corroded Q235 steel, reduce its sensitivity to corrosion, and enable its use in multiple environments. This study employs the sol-gel method, using manganese nitrate solutions of varying concentrations to treat the surface of Q235 steel after different electrolysis times. The optimal conditions for precursor preparation were found to be a Mn2+ concentration of 0.1 mol/L and an electrolysis time of 2 h. Electrochemical tests using NaCl solutions of different concentrations revealed a significant reduction in the corrosion current for the composite coating based on Q235 steel treated with this method in NaCl solutions with wt.% = 1, 2, 3, 4, 5. Furthermore, the resistance to corrosion was strongest in the NaCl solution with a concentration of 1 wt.% where the corrosion current decreased from 24.8 µA/cm2 to 6.79 µA/cm2. Additionally, the coating was found to be diffusion-controlled in the early stages of the corrosion process and charge transfer-controlled in the later stages. The MnFe2O4 spinel coating demonstrated the greatest enhancement in corrosion resistance in the wt.% = 1 NaCl solution.

Study on microstructure and thermal shock resistance of plasma sprayed Cr2O3/8YSZ composite coating

In order to explore the high temperature performance of Cr2O3/8YSZ composite coating, four kinds of Cr2O3/8YSZ composite coatings were prepared on the surface of Q235 steel by using the plasma spraying technology (the content of 8YSZ is 50%, 30%, 20% and 0%, respectively). The morphology of the coating was characterized through thermal field emission scanning electron microscopy, and the distribution of elements in the section of the coating was scanned by using EDS line. The phase composition of the composite coating was analyzed by using X-ray diffractometer, and the surface roughness of the composite coating was measured by using surface profilometer. The microhardness of the coating was measured by using automatic micro-Vickers hardness tester, and the scratch resistance of the coating was compared by using scratch tester. The thermal shock resistance of the coating was tested in Gleeble-3800 thermal physical simulator, and the cross section morphology after thermal shock was observed and analyzed. The results show that when the ratio of Cr2O3 to 8YSZ is 7∶3, the sample coating has good thermal shock resistance due to the deflection effect of 8YSZ on the vertical cracks and the thermal stress release effect of the pores and cracks in the coating.

Gum Arabic microgel–based biomimetic waterborne anticorrosive coatings with reinforced water and abrasive resistances

The inadequate water resistance and mechanical properties of waterborne anticorrosive coatings is a serious problem that leads to coating failure. When the bark of acacia trees sustains damage, the liquid Gum Arabic (GA) that oozes from the trunk coagulates at the site of injury to safeguard it, which is called “gummosis” self-protection. Inspired by this, biomimetic GA microgel–based waterborne anticorrosive coatings are designed. Microgel exhibits a crosslinked polymer network structure with a combination of advantageous characteristics derived from both solids and liquids. By encapsulating the liquid corrosion inhibitors (MeBT) within the solid microgel matrix, the coating system is endowed with self-protective capabilities. The as-prepared GAMG–MeBT microgels are introduced into waterborne epoxy (WE) matrix and sprayed onto the surface of Q235 steel. Corrosion studies reveal the 3.0-wt% GAMG–MeBT/WE coating exhibits an impedance modulus value in the low-frequency region (Z0.01Hz) of 1.37 × 109 Ω cm2 after immersing in 3.5-wt% NaCl solution for 60 days, which is nearly two orders of magnitude higher than that of the pure WE coatings. Moreover, the coatings display improved water resistance, enhanced abrasive resistance, and active corrosion protection. This work provides a new approach to solving the failure of WE anticorrosive coatings.

Synthesis of Gemini-type imidazoline quaternary ammonium salt using by-product fatty acid as corrosion inhibitor for Q235 steel

Gemini-type imidazoline quaternary ammonium salt is a new type of environmentally friendly corrosion inhibitor has been widely used in engineering materials. However, most of them are hazardous/toxic compounds derived from petroleum-based products, which did harm to environment. In this work, an environmentally friendly Gemini-shaped imidazoline quaternary ammonium salt corrosion inhibitor (G211) was synthesized using cheap fatty acid recycled from dimer acid industry as feedstock. The corrosion inhibition effects of G211 on Q235 steel in 1 M HCl solution were investigated through weight loss experiments, potential polarization curves, and alternating current impedance spectroscopy experiments. The results show that the inhibition rate of G211 as a mixed-type inhibitor is up to 94.4% and the concentration drop as low as 500 ppm at 25 ℃. The adsorption of G211 on Q235 surface follows Langmuir adsorption isothermal curve. The chemical composition of the Q235 steel surface was analyzed through scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Furthermore, the possible corrosion inhibition mechanism of G211 on the surface of Q235 steel is proposed. This article not only presents an outstanding solution for safeguarding Q235 steel against corrosion but also introduces a feasible method for high-value utilization of monomer acid (MA).

Effect of B addition on the microstructure and tribological properties of laser cladding FeCoCrNiCu composite coatings

The high-entropy alloy coatings of FeCoCrNiCuBx (x = 0, 0.1, 0.3, 0.5, x values are molar ratios) were prepared on the surface of Q235 steel by laser cladding. The microstructure, microhardness, and surface energy of the FeCoCrNiCuBx coatings were investigated, and the tribological property and wear mechanism of the composite coatings at room temperature (RT) and 600 ℃(HT) were analyzed. The FeCoCrNiCu coating consists of a single FCC-type solid solution. When x = 0.3, 0.5, the composite coatings appear the Cr2B phase. The x = 0.5 (B5) coating has the lowest surface energy (27.45mN/m), which is one of the reasons it has excellent tribological properties. The tribological properties of FeCoCrNiCuBx composite coatings were improved at both RT and HT. The B5 coating has excellent tribology at both RT and HT. At RT, the wear resistance of the B5 coating (wear rate is 8.54 ×10−5 mm3/N∙m, coefficient of friction (COF) is 0.51) was improved by 54.79%, 50.89%, and 12.86% compared with x = 0(HEA), x = 0.1(B1), and x = 0.3(B3), respectively, the COF reduced by 42.69%, 41.39%, 22.73%. At HT the wear resistance of the B5 coating (wear rate is 6.69 ×10−5 mm3/N∙m, COF is 0.24) was increased by 71.53%, 52.91%, and 49.42% compared to HEA, B1, and B3, respectively, the COF reduced by 29.41%, 25.00%, 17.24%. The wear mechanisms of coatings that add B element at RT are abrasive wear and fatigue wear, and at HT are mainly oxidative wear, moderate abrasive wear and fatigue wear.B2O3 melts at HT to form a low-viscosity liquid that forms a lubricating film that isolates the contact surfaces and reduces direct contact and adhesion. This is the main reason for the excellent friction properties of B5 coating at HT.

Experimental and computational exploration of the biodegradable platanus acerifolia leaf extract against mild steel corrosion in hydrochloric acid

This study delved into the potential application of Platanus acerifolia leaf extract (PALE) as an environmentally benign corrosion inhibitor. Evaluation of corrosion inhibition was conducted using electrochemical methods, field emission scanning electron microscopy equipped with energy dispersive spectrometer. The results reveal that PALE offers efficient protection for Q235 steel across the temperature range of 298 K–318 K, achieving a maximum corrosion inhibition efficiency of approximately 93%. Furthermore, Density functional theory (DFT) calculations and molecular dynamics (MD) simulations were performed to elucidate the spontaneous and stable adsorption of PALE molecules onto the surface of Q235 steel. This adsorption impedes the diffusion of corrosive substances towards the steel surface, thereby endowing Q235 steel with robust corrosion resistance.

Experimental and theoretical investigation of 1-Hexyl-3-methylimidazolium iodide as a corrosion inhibitor for mild steel in HCl environment

This study employed 1-Hexyl-3-methylimidazolium iodide to mitigate the corrosion of Q235 steel in a hydrochloric acid environment. The evaluation of corrosion inhibition effectiveness was comprehensively characterized by combining electrochemical experiments with surface morphology observation. The experimental results demonstrated the capability of the ionic liquid in establishing a film layer on the surface of Q235 steel, which effectively hindered the charge transfer process. Notably, the corrosion inhibition efficiency attained a value of 92.3% at a concentration of 1 mM corrosion inhibitor. Moreover, the process of the corrosion inhibitor adhering to the steel surface aligns with the Langmuir isotherm, demonstrating physicochemical adsorption behavior. The density functional theory (DFT) and molecular dynamics (MD) simulation were utilized for further exploration of the corrosion inhibition mechanism, and the results indicate the ionic liquid can be adsorbed onto the (110) surface of Fe in parallel through N atoms on the imidazole ring.

Microstructure and Wear Performance of High-Velocity Arc Sprayed FeMnCrNiBNbAl Coating

In this study, FeMnCrNiBNbAl wear-resistant coatings were prepared via high-velocity arc spraying technology on the surface of Q235 steel. The effects of spraying distance, voltage, and current on the coating performance were studied via the orthogonal experimental method with microhardness and porosity as evaluation indicators, and the process parameters were optimized. The order of primary and secondary factors affecting coating performance were: spraying distance, voltage, and current. The optimized process parameters are: spraying distance 200 mm, voltage 36 V, and current 240 A. The coating prepared using the optimized process parameters has an average microhardness of 756 HV0.1 and an average porosity of 1.03%. The coating mainly consists of α-Fe, Fe-Cr, Ni-Cr-Fe, Al2O3, and (Fe, Ni) solid solution. The coating friction coefficient was 0.5 while that of the substrate was 0.7. The depth and width of the wear marks of the coating were 6.32 µm and 555.41 µm, respectively, which are 66% and 32% lower in comparison with Q235 steel under the same test conditions. The wear forms of this coating were mainly fatigue peeling and adhesive wear.

Study on the corrosion inhibition performance of Schiff base corrosion inhibitor on Q235 steel

Q235 steel is widely used in industry and daily life, and it is prone to corrosion during use, especially in hydrochloric acid solution where corrosion is particularly severe. Schiff base organic compounds can significantly inhibit the corrosion of Q235 steel in hydrochloric acid solution, making them a green and environmentally friendly organic compound. This article uses aniline, octadecylamine, and glutaraldehyde as raw materials to prepare two Schiff base corrosion inhibitors, namely bisaniline Schiff base and bisoctadecylamine Schiff base (named BXFJ and SXFJ respectively). The corrosion inhibition performance and mechanism of these two Schiff base inhibitors in Q235 steel in hydrochloric acid solution were studied using weight loss method, electrochemical testing, quantum chemical theory calculation, and molecular dynamics simulation. The results of weight loss method and electrochemical testing show that in a 1mol/L HCl solution, the corrosion inhibition performance of BXFJ at a concentration of 25mg/L is higher than that of SXFJ, indicating that BXFJ can exert excellent corrosion inhibition performance in HCl environment. Density functional theory (DFT) indicates that the active sites of the two Schiff bases are C=N double bonds, and molecular dynamics (MD) further confirms that both Schiff base corrosion inhibitors can adsorb on the surface of Q235 steel.

Insights into the corrosion resistance of a novel quinoline derivative on Q235 steel in acidizing medium under hydrodynamic condition: experimental and surface study

Abstract The study concentrated on the fabrication of an environmentally friendly inhibitor, namely ethyl 4-(4-methoxyphenyl)-2,7,7-trimethyl-5-oxo-1,4,5,6,7,8-hexahydroquinoline-3-carboxylate derivative of quinoline (MQC), in a single step, and assessed its inhibiting property in highly acidic fluid (15 % HCl) for protecting Q235 steel at 1500 rpm rotation speed. Weight reduction, Potentiodynamic polarization, and electrochemical impedance spectroscopy were utilized in the study to investigate the inhibiting impact of MQC. The estimated findings corroborated the inhibiting data of 93.54 and 98.38 % at 308 K with 100 mg/L/only MQC and MQC + KI/75 mg/L + 0.5 mM, respectively, and the impact of temperature upon the inhibitory capability possessed little impact at larger dose quantities. According to the electrochemical outcomes, the MQC is a mixed-type corrosion inhibitor. The findings of the SEM, EDX, and AFM examinations demonstrated that the MQC established a barrier over the surface of Q235 steel by adsorption, changing the hydrophilic and hydrophobic attributes of the Q235 steel surface. An additional XPS assessment demonstrated MQC molecule adsorption on the Q235 steel surface. Density functional theory (DFT) and molecular dynamic simulations (MD) calculations were further performed to justify the experimental results.

Dry sand abrasion characteristics of WC-10Ni+NiCrBSi coatings

A WC-10Ni/NiCrBSi coating was prepared and applied to the surface of Q235 steel through vacuum brazing. Using a self-developed dry sand abrasion test machine, the effects of the abrasive sand’s type, load, and sliding speed on the dry sand abrasion property of the coating were analysed. The wear mechanism of dry sand abrasion was also investigated. The results indicated that the coating cross-section comprised three layers: the substrate, the interface layer, and the surface layer. The hard layer served as the main distribution area of WC hard particles, which directly determined the hardness and wear resistance of the coating. WC particles, fortified by a γ-Ni solid solution, enhanced the wear resistance and hardness of the coating. In the friction and wear test, when ceramic abrasives were employed, the coating sample exhibited a loss of only 23 mg, constituting only 7.9% of that observed with quartz sand abrasives. Under low loading conditions, the wear mass loss exhibited a linear relationship with the applied load. During these low-load scenarios, the abrasive particles operated through a rolling motion, thereby entailing an abrasive wear mechanism. Conversely, when the load exceeded 0.05 MPa, the primary mode of abrasive particle motion transitioned into sliding with burial, resulting in a combination of fatigue wear and abrasive wear mechanisms. Therefore, the dry sand abrasion mechanism inherent to composite coatings can be attributed to the protective shielding role played by WC particles on the substrate. This shielding function effectively mitigates and counteracts the abrasive cutting effects induced by abrasive particles.

Process optimization and quality prediction of laser aided additive manufacturing SS 420 based on RSM and WOA-Bi-LSTM

Laser aided additive manufacturing (LAAM) is a promising method for surface modification, repair, and direct fabrication 3D components. Nevertheless, the high cost and time-consuming nature of trial-and-error based process development hinder the progress of this technology. Consequently, machine learning has garnered substantial attention from both the academia and industrial sectors due to its ability to expedite process study for both research and industrial applications. This paper presents a study on the LAAM of 420 stainless steel on the surface of Q235 steel using the combined Response Surface Methodology (RSM) and Whale Optimization Algorithm-Bidirectional Long Short-Term Memory (WOA-Bi-LSTM) model. The results show that the process parameters can be effectively optimised to improve the prediction accuracy using the multi-objective whale optimisation algorithm for the fitted equations obtained in response surface analysis. At the same time, with the support of a large number of data, the WOA-Bi-LSTM model can accurately predict the quality of the LAAMed material, which is better than the response surface analysis method.

Long chain imidazole derivative as a novel corrosion inhibitor for Q235 steel in 15 % HCl medium under hydrodynamic condition: Experimental and theoretical examinations

The research in the paper focused in the development of ecologically favorable inhibitor via microwave method. The inhibitor namely N-(2-(2-pentadecyl-2,5-dihydro-1H-imidazole-1-yl)ethyl)palmitamide palmitate, a derivative of imidazole (IPP) was synthesized in one single step and screened its inhibitive property in strongly acidic medium (15 % HCl) for protection of Q235 steel at 1500 rpm rotational speed. The study used for exploring the inhibition effect of IPP includes weight loss, Potentiodynamic polarization, and electrochemical impedance spectroscopy. The estimated results confirmed the inhibition data of 97.41 % and 98.70 % at 308K with 200 mg/L/only IPP and IPP + KI/150 mg/L+0.5 mM respectively, and the influence of temperature has little effect over the inhibition property. The weight loss results show that the IPP belongs to a mixed-type corrosion inhibitor. The SEM, EDX, AFM, SKP, and contact angle analysis results showed that the IPP formed a film on the surface of Q235 steel through adsorption, which changed the hydrophilic and hydrophobic properties of the Q235 steel surface. Further XPS study confirmed the adsorption of IPP molecules over the Q235 steel surface.

Effect of Process Parameters on Microstructure and Properties of Laser Cladding Ni60+30%WC Coating on Q235 Steel.

A Ni60+30%WC composite coating was prepared on the surface of Q235 steel by utilizing a high cooling rate, small thermal deformation of the substrate material, and the good metallurgical bonding characteristics of laser cladding technology. This paper focuses on the study of the composite coatings prepared under different process parameters in order to select the optimal process parameters and provide theoretical guidance for future practical applications. The macroscopic morphology and microstructure of t he composite coatings were investigated with the help of an optical microscope (OM) and a scanning electron microscope (SEM). The elemental distribution of the composite coatings was examined using an X-ray diffractometer. The microhardness and wear resistance of the composite coatings were tested using a microhardness tester, a friction tester, and a three-dimensional (3D) profilometer. The results of all the samples showed that the Ni60+30%WC composite coatings prepared at a laser power of 1600 W and a scanning speed of 10 mm/s were well formed, with a dense microstructure, and the microhardness is more than four times higher than the base material, the wear amount is less than 50% of the base material, and the wear resistance has been significantly improved. Therefore, the experimental results for the laser power of 1600 W and scanning speed of 10 mm/s are the optimal process parameters for the preparation of Ni60+30%WC.

Investigation of Q235 steel electrochemical corrosion behavior in naturally dried sandy soil

Based on electrochemical technology, the electrochemical corrosion behaviour of Q235 steel in sandy soil under naturally dried condition was studied comprehensively from two aspects: Q235 steel and sandy soil. The results show that the sandy soil is basically neutral and the temperature fluctuates around 20 ℃ under naturally dried condition. The moisture in the sandy soil gradually dries from the initial saturation state of 30 % within 14 d. The impedance spectrum shows that at 5 d, corrosion of Q235 steel is greatest when the radius of capacitive arc reaches a minimum. The variation law of modulus and phase angle with water is consistent with the impedance spectrum. After 5 d, modulus and phase angle fluctuates greatly in the frequency domain of 103∼105 Hz. The polarization curve shows that when the moisture content is 10.2 %(7 d), the polarization curve of Q235 in the sandy soil corresponds to the highest corrosion current density, which is moderate corrosion, and the rest is mild corrosion. The average corrosion rate is 1.51E-2 mm/a. Various thicknesses of brown-yellow corrosion products (Fe2O3) have accumulated on the surface of Q235 steel, showing honeycomb, flocculent, etc. formations. The corrosion of Q235 steel in local areas is strong, and more corrosion pits are formed.

Effect of zinc oxide on corrosion resistance of magnesium ammonium phosphate cement-based coating

In order to improve the anticorrosive performance of magnesium ammonium phosphate cement (MAPC) coating, a small amount of zinc oxide was added to the MAPC coating to modify and coat the surface of Q235 steel. The anti-corrosion resistance and mechanism of MAPC coating modified by zinc oxide were analyzed based on electrochemical test results, and the morphology and composition changes of the coating before and after immersion were observed and tested using X-ray diffraction (XRD), scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS), and a thermogravimetric analyzer (TG-DTG). Low field nuclear magnetic resonance testing was used to determine the porosity of the coating and the corrosion resistance of the modified coating was tested by a neutral salt spray test. The results show that after immersion in a 3.5% NaCl solution for 28 days, the MAPC coating with 3% (mass fraction) zinc oxide exhibited a corrosion current density of 2.96 × 10-4 μA/cm2 at a corrosion potential of −0.870 V, demonstrating a favorable outcome with a positive shift.; Meanwhile, the 28 days polarization resistance of the modified coating was 97436 Ω∙cm2, which was 78% higher than that of the blank. The shielding performance of the coating was enhanced, and the charge transfer resistance was also significantly improved. The porosity of the modified coating before and after immersion was lower than that of the blank group. After 1440 h of neutral salt spray testing, there was no swelling or peeling on the coating surface, and there was no trace of corrosion on the internal substrate.

Experimental and theoretical investigations of three Mannich-base imidazoline quaternary ammonium salts as efficient inhibitors for Q235 steel in sulfuric acid

Three Mannich base imidazoline quaternary ammonium salt corrosion inhibitors were designed and successfully synthesized, and their inhibition properties and mechanisms for Q235 steel in H2SO4 solution were investigated by experiments and theoretical calculations. It is found that three inhibitors act as mixed inhibitors to effectively inhibit the corrosion of Q235 steel in H2SO4 solution by chemisorption, and the maximum corrosion inhibition efficiency reaches 96.9 %, 97.3 % and 98.2 %, respectively. Theoretical calculations reveal that three inhibitors exhibit multi-center adsorption features and spontaneously adsorb on the surface of Q235 steel through horizontal orientation.

Corrosion inhibition performance of Punica granatum L extract on Q235 steel in H2SO4 environment: Electrochemical, morphological, and quantum chemical studies

The corrosion inhibitor used in this experiment was the extract of Punica granatum L (PGLE), which was obtained using the pure water extraction method. The inhibition performance of PGLE on Q235 steel in H2SO4 environmental was investigated using electrochemical methods, morphology studies and quantum chemical calculation. The corrosion inhibition properties of PGLE were found to be excellent, with a corrosion inhibition efficiency of approximately 95% at 200 mg/L, and it exhibits characteristics of a mixed-type corrosion inhibitor. The electrochemical impedance (EIS) test revealed a remarkable increase in the charge transfer resistance with the increment of PGLE concentration, and the surface of Q235 steel was covered by a tight and well-organized protective layer of PGLE. The surface morphology test indicates a noticeable decrease in the average surface roughness upon the adsorption of PGLE extract onto the Q235 steel. According to the adsorption isotherm analysis, the adsorption behavior of PGLE on Q235 steel conformed to the Langmuir adsorption. Additionally, adsorption might be physical or chemical. Quantum chemical calculations also showed that PGLE has excellent corrosion inhibition properties.

Preparation and properties of Al/Si coating with excellent formability and corrosion resistance on steel plate

In order to simultaneously improve formability of the coated steel and corrosion resistance of steel, Al/Si coating with tailored Si content, controllable composition and structure were prepared on Q235 by combining magnetron sputtering and then treated by heat treatment. The effect of Si content on the thickness, composition, structure of Al/Si coating on the surface of Q235 steel, and corrosion resistance and formability of Al/Si coated Q235 steel were systematically investigated. With 160 W of Al target power and different Si target power (0, 60, 80 and 100 W), the thickness of the coating on Q235 steel for 1.5 h is about 5 µm. Al/Si coating thickness with 80 W of Si target power is 5.33 ± 0.32 µm. The coating on Al/Si80-Q235 is uniform and dense, and mainly consists of FeAl2Si, Fe3Al, Fe2Al5, and Al2O3. Al/Si80-Q235 demonstrated excellent formability and Al/Si80 coating improved corrosion resistance of Q235 steel. When immersed in NaCl solution, the self corrosion current density of Al/Si coated Q235 was significantly lower than Al coated Q235. Especially, the self corrosion current density of Al/Si80-Q235 was only 1/51 that of Al coated Q235. The corrosion resistance of Al/Si coated steel was remarkably improved compared with Al coated steel due to the addition of Si.