Corrosion Resistance In Artificial Saliva Research Articles

The Long-term Corrosion Behaviors of SLM 316L Stainless Steel Immersed in Artificial Saliva

The Selective Laser Melting (SLM) is an effective method to produce highly corrosion resistant Oral Alveolar Implants (OAI) by changing the scanning speed. Nevertheless, the long-term corrosion behavior of SLM 316L orthodontic bracket alloys in artificial saliva is overlooked in previous studies. In this study, 316L SS samples fabricated by SLM at different scanning speeds (800 mm/s, 1200 mm/s, and 1600 mm/s) were conducted a long-term (90 days) immersion test by being put into artificial saliva with three different pH values (pH 1.5, pH 4, and pH 6). The morphology, XRD and especially corrosion behavior of the samples fabricated by SLM and forging were investigated. The XRD results exhibit that high-speed scanning accelerates the cooling rate and inhibits the δ → γ phase transformation proceeding. Corrosion results show that the corrosion attack induced by pre-existing pores will expand through the crevices and break down the surface structure around the pores, leading to corrosion damage area to expand to several times of the original pore area. Besides, the mean corrosion rate of the sample at a scanning speed of 800 mm/s shows better corrosion resistance in artificial saliva of pH 4 and pH 6. Compared with wrought 316L SS samples, the SLM 316L SS samples had an obvious difference in the performance of corrosion rate and corrosion behaviors.

Experimental Study Regarding the Behavior at Different pH of Two Types of Co-Cr Alloys Used for Prosthetic Restorations.

Cobalt-chromium (Co-Cr) alloys are widely utilized in dentistry. The salivary pH is a significant factor, which affects the characteristics and the behavior of dental alloys through corrosion. This study aimed to evaluate the corrosion behavior in artificial saliva with different pH values (3, 5.7, and 7.6) of two commercial Co-Cr dental alloys manufactured by casting and by milling. Corrosion resistance was determined by the polarization resistance technique, and the tests were carried out at 37 ± 1 °C, in Carter Brugirard artificial saliva. After the electrochemical parameters, it can be stated that the cast Co-Cr alloy has the lowest corrosion current density, the highest polarization resistance, and the lowest speed of corrosion in artificial saliva with pH = 7.6. In the case of milled Co-Cr alloy, the same behavior was observed, but in artificial saliva with pH = 5.7, it recorded the most electropositive values of open circuit potential and corrosion potential. Although both cast and milled Co-Cr alloys presented a poorer corrosion resistance in artificial saliva with a more acidic pH value, the milled Co-Cr alloy had better corrosion behavior, making this alloy a better option for the prosthetic treatment of patients suffering from GERD.

Improvement of in vitro corrosion, wear, and mechanical properties of newly developed Ti alloy by thermal treatment for dental applications

Abstract The effects of thermal treatments on the structure, mechanical properties, wear resistance, and in vitro corrosion protection in artificial saliva (AS) were investigated for a newly developed Ti20Nb13Zr (TNZ) alloy. XRD and SEM analyses were used for structural and microstructural analysis. The in vitro corrosion properties of the samples were investigated using electrochemical impedance spectroscopy and linear polarization resistance techniques up to an immersion time of 168 h. The tribological characteristics were evaluated with a linear reciprocating tribometer. SEM analysis showed that solution treatment and aging influenced the size and distribution of α phase. The air-cooled and aged samples exhibited the highest microhardness and macrohardness, for which the wear resistances were 25% and 30% higher than that of the untreated sample, respectively. The cooling rate significantly influenced the corrosion resistance of the TNZ samples. The treated samples showed a reduced corrosion rate (50%) for long immersion time up to 168 h in AS. The furnace-cooled and aged samples exhibited the highest corrosion resistance after 168 h of immersion in AS. Among the treated samples, the aged sample showed enhanced mechanical properties, wear behavior, and in vitro corrosion resistance in AS.

Análisis del proceso de degradación y comportamiento electroquímico de la aleación de magnesio AZ31 en saliva artificial

En el presente trabajo se ha aplicado una combinación de pruebas de inmersión, técni­cas de análisis de superficie y métodos electroquímicos para caracterizar el proceso de degradación de la aleación de magnesio AZ31 cuando ha sido expuesta a saliva artificial durante 28 días. La superficie de la aleación fue evaluada en dos condiciones: simple y con una capa de MgF2. Esta capa de conversión se formó sumergiendo el AZ31 en ácido fluorhídrico (HF). Las imágenes SEM revelaron diferencias en el ataque de corrosión de las dos condiciones de la superficie, específicamente en la vecindad de las partículas inter-metálicas de Al-Mn. Tanto el análisis EDS como XPS indicaron que la composición de las capas de corrosión formadas durante las pruebas de inmersión corresponde principalmente a Mg(OH)2 y Ca10(PO4)6(OH)2 para la muestra simple, mientras que para la superficie tratada el producto de corrosión principal fue MgCO3. El valor de resistencia a la polarización (Rp) estimado a partir de los experimentos EIS fue dos órdenes de magnitud mayor para las muestras tratadas con HF que para las muestras simples. Además, la velocidad de corrosión (CR) calculada a partir de las curvas de polarización potenciodinámica (PDP) fue menor para la superficie tratada con HF que para la superficie simple de AZ31. Todos los resultados han indicado que el tratamiento con HF en la superficie de aleación de magnesio AZ31 mejora significativamente su resistencia a la corrosión en saliva artificial.

Microstructural examination and corrosion behavior of selective laser melted and conventionally manufactured Ti6Al4V for dental applications

The selective laser melting of Ti6Al4V would induce definite changes in the microstructure that may affect its corrosion properties. Microstructural examination showed the formation of relatively thin beta (β) lamella in selective laser melted (SLM) Ti6Al4V compared to wrought Ti6Al4V. X-ray diffraction analysis (XRD) analysis confirmed the presence of alpha and beta phases in both SLM and wrought Ti6Al4V. However, the higher concentration of the β phase in SLM Ti6Al4V compared to wrought Ti6Al4V was evident in the microstructure. As candidate dental implant materials, the corrosion behavior of both SLM and wrought Ti6Al4V was assessed in artificial saliva (AS) and deionized water (DI) containing various species i.e. fluoride (F), calcium chloride (CaCl2) and lactic acid (LA). Electrochemical impedance spectroscopy and potentiodynamic polarization analysis was carried out to estimate the corrosion behavior of SLM and wrought Ti6Al4V at room temperature. SLM Ti6Al4V offered better corrosion resistance than wrought Ti6Al4V in all solutions at pH>6. However, wrought Ti6Al4V comparatively presented high corrosion resistance in AS + LA, DI+CaCl2 and DI+LA solutions (pH<6). The lower dissolution rate of SLM Ti6Al4V (at pH>6) was attributed to larger β content in the microstructure compared to wrought Ti6Al4V.

Investigation of the Microstructure, Hardness and Corrosion Resistance of a New 58Ag24Pd11Cu2Au2Zn1.5In1.5Sn Dental Alloy.

Higher-noble dental alloys (Au, Ag, and Pd) are the most desirable for dentistry applications, but they are expensive. Low-noble (Ag, Pd, Cu) dental alloys are alternatives to higher-noble ones due to their lower price. In this regard, the paper supports the price lowering of dental alloy by increasing the Cu content, i.e., a new 58Ag24Pd11Cu2Au2Zn1.5In1.5Sn dental alloy. The increasing addition of the Cu leads to a complex structure consisting of a solid solution that engulfs compounds of micrometric and nanometric sizes. The 58Ag24Pd11Cu2Au2Zn1.5In1.5Sn has demonstrated a much better electrochemical corrosion behavior in artificial saliva compared to the Paliag and Unique White dental alloys. The improved corrosion behavior of the new alloy is supported by the diminishing of the Cu selective diffusion into the electrolyte due to its retaining into compounds and into Ag-Pd solid solution. Also, the synergic effects of Cu, Zn, In, Sn may improve the corrosion resistance, but they have strengthened the 58Ag24Pd11Cu2Au2Zn1.5In1.5Sn matrix. The main finding addressed in the paper consists in a new 58Ag24Pd11Cu2Au2Zn1.5In1.5Sn dental alloy with improved corrosion resistance in artificial saliva.

Spark plasma sintering of Ti6Si2B-based Ti-Si-B alloys and their corrosion resistance in artificial saliva and SBF media

Titanium alloys are widely used for dental, medical, automotive, aeronautic and aerospace applications due to their chemical, physical, biological and mechanical properties. Orthopedic implants of the as-cast and heat-treated Ti–10Si–5B alloy present good bone integration capacity as well as Tiss+Ti6Si2B alloys exhibit higher oxidation resistance than Tiss+Ti5Si3 alloys. In this sense, Ti-8Si-4B, Ti-10Si-5B, Ti-14Si-7B, Ti-20Si-10B, and Ti-22Si-11B alloys (atomic percentage - at.-%) with Ti6Si2B-based microstructures were produced by high-energy ball milling and further spark plasma sintering (SPS) at 1100 °C for 6 min under an uniaxial pressure of 191 MPa. Thus, the corrosion resistance of these SPSed Ti-Si-B alloys was evaluated using potentiodynamic polarization method in different media: artificial saliva (AFNOR NF S90-701) and simulated body fluid (SBF). The SPSed Ti-Si-B alloys were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy dispersive spectrometry (EDS). Porosity tests based on Arquimedes’ principle were also performed to evaluate their porosity and density. Despite the short sintering time, our results have confirmed that fine and dense SPSed Ti-Si-B samples with microstructures based on solid solution Ti (Tiss) and Ti6Si2B phases were produced from mechanically alloyed Ti-Si-B powders. The Ti-22Si-11B alloy containing higher amounts of Ti6Si2B presented lower values of passivation current density (2.69 and 0.08 μA.cm-2) and higher corrosion potential (−0.232 and −0.258 V) when compared to Ti-8Si-4B alloy (2.58 and 0.25 μA.cm-2; −0.396 and −0.339 V) in artificial saliva and SBF media, respectively. Moreover, it demonstrates superior corrosion resistant than Ti-7Zr-20Si-10B, Ti-13Nb-13Zr, Ti-6Al-4V and pure Ti.

Effect of the heat treatment on corrosion and mechanical properties of CoCrMo alloys manufactured by selective laser melting

PurposeThis study aims to focus on the heat treatment influence on the corrosion resistance, adhesion of Streptococcus mutans and mechanical properties of CoCrMo alloys manufactured by the selective laser melting (SLM).Design/methodology/approachCoCrMo alloys were manufactured using the Dimetal-100 machine. X-ray diffraction (XRD), metallographic analysis, scanning electron microscopy (SEM), electrochemical corrosion, Vickers microhardness and tensile tests were used to characterize SLM-produced CoCrMo alloys and compare them with the ones manufactured by casting and with the ASTM F75 standard.FindingsThe electrochemical results showed that SLM900 samples had the best corrosion resistance in artificial saliva. The adhesion results showed least propagation and overall quantity of Streptococcus mutans on the SLM900 sample. The microhardness, tensile and yield strength of As-SLM, SLM900 and SLM1200D samples were measured according to the ASTM F75 standard. The elongation of SLM900 was less than 8 per cent, which does not meet the standard specifications. Analysis of the fracture morphology showed that the fracture mechanisms of As-SLM and SLM1200D belong to the quasi-cleavage fracture type, and the mechanical fracture mechanism of SLM900 can be characterized as brittle fracture.Originality/valueThis paper presents the adhesion properties of Streptococcus mutans on the surface of CoCrMo alloys manufactured by SLM and proposes how to regulate the effect of the heat treatment on the corrosion resistance and mechanical properties of CoCrMo alloys manufactured by SLM.

Influence of pH on the Corrosion Behaviour of Laser-Processed Co-Cr Dental Alloys in Artificial Saliva

The materials used in dental restorations must present, aside from a mechanically stable and fracture resistant structure and a high level of biocompatibility, a strong resistance towards corrosion over a wide range of pH values. This research focuses on the relation between two different CAD-manufacturing procedures of base Co-Cr alloys used in dental restorations regarding the assessment of their corrosion resistance in artificial saliva at various pH levels. We comparatively appraised the corrosion behaviour of two cobalt-chromium dental alloys manufactured by two alternative computer assisted technologies namely selective laser melting (SLM) and selective laser sintering (SLS). Several electroanalytical techniques like linear polarization, cyclic voltammetry and electrochemical impedance spectroscopy have been employed to study the processes taking place at the metal/electrolyte interface. Preliminary results reveal that computer assisted processing technologies could represent an alternative when considering the manufacture of complex restorations.

The corrosion resistance in artificial saliva of titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion

In order to optimize and enhance the implant material properties, metallic materials may be modified by severe plastic deformation (SPD) procedures. One of the most attracting SPD methods is high-pressure torsion (HPT), which is method where deformation is obtained mainly by simple shear. In the present study ultrafine-grained titanium (UFG cpTi) and ultrafine-grained Ti-13Nb-13Zr (UFG TNZ) alloy were obtained by high pressure torsion (HPT) under a pressure of 4.1 GPa with a rotational speed of 0.2 rpm up to 5 rotations at room temperature. In order to analyse microstructure of materials before and after HPT process, scanning electron microscope (SEM) was used. The aim of this study was to determine the corrosion resistance of titanium and its alloy after HPT process. Electrochemical measurements were performed in artificial saliva with a pH value of 5.5 at 37°C, in order to simulate the oral environment. The materials were analysed by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. All examined materials showed good corrosion resistance, but results indicate that HPT process can improves corrosion resistance.

Effect of Fluoride Concentration and pH on Corrosion Behavior of Ti–15Mo in Artificial Saliva

Corrosion behavior of Ti–15Mo alloy in artificial saliva containing variation in pH (7.2, 3.5) and varying concentrations of fluoride ions (2500, 5000 and 10,000 ppm) was evaluated using potentiodynamic polarization, electrochemical impedance spectroscopy studies to ascertain its suitability for dental implant applications. The study reveals that there is a strong dependence of the corrosion resistance of Ti–15Mo alloy on the concentration of fluoride ions in the electrolyte medium. Surface morphological characterization was carried out using SEM–EDAX to investigate the corrosion resistance in artificial saliva containing sodium fluoride at various pH conditions, and it was found that the surface roughness of the specimens was highly increased at pH 3.5. In spite of the active dissolution, the Ti–15Mo alloy exhibits passivity at anodic potentials at all concentrations of the fluoride ions studied. The results suggest that Ti–15Mo alloy can be a suitable alternative for dental implant applications.

Assessment of corrosion resistance of cast cobalt- and nickel-chromium dental alloys in acidic environments

The aim of this study was to compare the degradation resistance of nickel-chromium (Ni-Cr) and cobalt-chromium (Co-Cr) alloys used as a base material for partial dentures in contact with saliva. Wiron® 99 and Wironit Extra-Hard® were selected as representative casting alloys for Ni-Cr and Co-Cr alloys, respectively. The alloys were tested in contact with deionized water, artificial saliva and acidified artificial saliva. Material characterization was performed by X-ray diffractometry (XRD) and microhardness and nanohardness testing. The corrosion properties of the materials were then analyzed using open circuit potential analysis and potentiodynamic analysis. Alloy leaching in solution was assessed by inductively coupled plasma mass spectrometry techniques. Co-Cr alloy was more stable than the Ni-Cr alloy in all solutions tested. Leaching of nickel and corrosion attack was higher in Ni-Cr alloy in artificial saliva compared with the acidified saliva. The corrosion resistance of the Co-Cr alloy was seen to be superior to that of the Ni-Cr alloy, with the former exhibiting a lower corrosion current in all test solutions. Microstructural topographical changes were observed for Ni-Cr alloy in contact with artificial saliva. The Ni-Cr alloy exhibited microstructural changes and lower corrosion resistance in artificial saliva. The acidic changes did not enhance the alloy degradation. Ni-Cr alloys are unstable in solution and leach nickel. Co-Cr alloys should be preferred for clinical use.

Aspects of the Structure and Corrosion Resistance of Materials Used in Tongue Piercings

For centuries, piercing was an expression of art around the world and constituted a significant part of the culture and rituals of many different civilizations. This study evaluated the microstructure and the corrosion resistance in artificial saliva of two newly implantable devices used in tongue piercing. We investigated materials microstructure by optical microscopy and scanning electron microscopy (SEM), followed by an energy-dispersive X-ray spectroscopy (EDX) analysis in order to determine elemental composition. The corrosion resistance was determined by linear polarization technique. The corrosion tests were performed in artificial saliva Fusayama Meyer (composition: 0.4 gl-1NaCl, 0.9 gl-1 KCl, 1 gl-1 urea, 0.69 gl-1 NaH2PO4, 0.795 gl-1 CaCl * 2H2O) with a pH = 5.2 at temperature of 37 ± 0.5°C. The materials used for these types of implants were identified as Ti-6Al-4V alloy (sample 1) and austenitic stainless steel (sample 2). From corrosion resistance evaluation point of view, sample 1 showed the most electropositive value and hence better corrosion behavior compared to sample 2, having the Ecor potential -398.24 mV but this is clearly according the chemical composition of these two metallic biomaterials.

Is niobium more corrosion-resistant than commercially pure titanium in fluoride-containing artificial saliva?

In this work, commercially pure niobium (c.p. Nb) was selected to study its electrochemical behaviour in artificial saliva with several concentrations of fluoride ions (F−) over a range of 0–0.24M. The chemical nature of passive layers on surface was characterised with x-ray photoelectron spectroscopy (XPS). The changes in surface topography due to F−-induced corrosion were examined with scanning electron microscopy (SEM). For comparison, commercially pure titanium (c.p. Ti) was also investigated under identical conditions. Both c.p. Nb and c.p. Ti exhibit very good corrosion resistance in artificial saliva without F− or with a low level of F−, showing a low passive current density (jpass) and high polarisation resistance (Rp). However, as the F− concentration increases, c.p. Nb demonstrates a significantly greater corrosion resistance due to its stable passive film (mainly Nb2O5) with a thickness of several nanometres, showing a much lower jpass and higher Rp, with both values differing from those of c.p. Ti by over one order of magnitude. Significant differences in the corrosion behaviour between c.p. Nb and c.p. Ti can be understood from the thermodynamic perspective and the propensity of oxide dissolution. The advantage of niobium over titanium merits attention, as the c.p. Nb and Nb-based alloys are promising for further applications in dental prosthesis fabrication.

Evaluation of Chill Cast Co-Cr Alloys for Biomedical Applications

Binary Co-Cr alloys containing various Cr contents were vacuum induction melted and cast into wedge-shaped copper molds. It was intended to develop a microstructure (1) free from interdendritic segregation and porosity; (2) having minimal intermetallic precipitates; and (3) suitable for biomedical applications. The resultant microstructures were evaluated from sections obtained longitudinally and centrally in the plane normal to the diverging wedge faces. All ingots showed a dendritic microstructure with some characteristic features. For instance, in Co-20–30 wt. % Cr alloys, the chilled cast microstructures consisted of columnar dendrites without interdendritic segregation, a minimum of intermetallic precipitates, and the presence of a predominantly athermal HCP ε-martensite (&gt;80 vol. %). In addition, the metastable FCC γ-Co phase was identified by X-ray diffraction and scanning electron microscopy. In the case of 35–44 wt. % Cr cobalt alloys, a eutectic constituent including the σ-phase were found to develop in the interdendritic regions. From this work, a Co-20 wt. % Cr alloy was chosen for further investigation after heat treating below the γ/ε transition temperature. The resultant tensile strength and ductility were further improved after applying a heat treatment at 730 °C for 30 min, obtaining values of elongation of 26% as compared with 2.55 &lt; 5 of elongation in the as cast condition. Also, the alloy corrosion resistance in artificial saliva was investigated. It was found that the exhibited corrosion rates for the as-cast and heat-treated conditions are between those reported for other similar systems.

Corrosion resistance in artificial saliva of titanium anodized by plasma electrolytic oxidation in Na3PO4

Abstract In order to improve the chemical and electrochemical resistance of titanium as well as its potential bioactivity, coatings were formed by using plasma electrolytic oxidation under galvanostatic conditions in a phosphate containing electrolyte. The grown anodized layers were characterized at different stages of the oxidation process, corresponding to different voltages. The structure and composition of the coatings were investigated by XRD, SEM-EDS and μ-Raman spectroscopy. The electrochemical behaviour of the coated materials was evaluated in acidified artificial saliva by using classical stationary methods and electrochemical impedance spectroscopy. Before the initiation of sparks, an inner layer is formed by a classical anodizing mechanism. This layer plays the role of barrier, improving the corrosion resistance of titanium in artificial saliva. As soon as the sparking phenomenon starts, a more compact overlayer grows. Due to the presence of large cracks, the corrosion resistance is no more improved.

Corrosion Behavior in Artificial Saliva of Personalized Dental Crowns of Co-Cr Alloys Manufactured by DMLS Process

The purpose of this paper is to realize some researches concerning the powder Co-Cr, the sintering compacts obtain after Direct Metal Laser Sintering manufacturing and the corrosion resistance in artificial saliva. The Co-Cr alloys are used frequently in dentistry to realize personalized dental crown, bridges, chapels, dental implants or microsurgery instruments. The Co-Cr powders are used in Direct Metal Laser Sintering technologies to obtain personalized dental crown with complex forms after a ”stl” file, realized after a tomography or oral scanning. Direct Metal Laser Sintering process is used to realize quickly a scale model of physical part or assembly using 3D computer aided design CAD data. This alloy must present good corrosion behavior and mechanical resistance to be used in medical domain.

&lt;i&gt;In Vitro&lt;/i&gt; Corrosion Behaviour of Metallic Dental Materials

Typical applications of metallic dental materials include metal-ceramic restorations, dental implants or orthodontic systems. Due to their contact with human tissues, corrosion resistance is one of the main requirements for dental materials. In the present paper, the corrosion behaviour in Fusayama Meyer artificial saliva solution (pH=5.2) on a selection of four different metallic dental materials (316 L steel, Au based alloy, cp-Ti, Ti6Al4V alloy) currently used in dentistry were investigated. The metallic dental materials have been investigated in terms of electrochemical analysis, chemical composition, morphology before and after corrosion, wettability and roughness. The results showed a hydrophilic behaviour in the case of Au based alloy, cp-Ti and Ti6Al4V alloy, and hydrophobic for 316L stainless steel. Considering the main electrochemical parameters, the cp-Ti alloy exhibited better corrosion resistance in artificial saliva with pH=5.2, followed by Au based alloy, Ti6Al4V alloy and 316L stainless steel. The main objective of the present paper was to evaluate the corrosion behaviour, as in important factor in the selection of metallic materials used in dentistry.

Corrosion in artificial saliva of a Ni-Cr-based dental alloy joined by TIG welding and conventional brazing

Statement of the problemFixed prosthesis and partial dental prosthesis frameworks are usually made from welded Ni-Cr-based alloys. These structures can corrode in saliva and have to be investigated to establish their safety. PurposeThe purpose of this study was to evaluate the corrosion behavior of joints joined by tungsten inert gas (TIG) welding and conventional brazing in specimens made of commercial Ni-Cr alloy in Fusayama artificial saliva at 37°C (pH 2.5 and 5.5). Material and methodsEighteen Ni-Cr base metal specimens were cast and welded by brazing or tungsten inert gas methods. The specimens were divided into 3 groups (base metal, 2 welded specimens), and the composition and microstructure were qualitatively evaluated. The results of potential corrosion and corrosion current density were analyzed with a 1-way analysis of variance and the Tukey test for pairwise comparisons (α=.05). ResultsBase metal and tungsten inert gas welded material showed equivalent results in electrochemical corrosion tests, while the air-torched specimens exhibited low corrosion resistance. The performance was worst at pH 2.5. ConclusionsThese results suggest that tungsten inert gas is a suitable welding process for use in dentistry, because the final microstructure does not reduce the corrosion resistance in artificial saliva at 37°C, even in a corrosion-testing medium that facilitates galvanic corrosion processes. Moreover, the corrosion current density of brazed Ni-Cr alloy joints was significantly higher (P<.001) than the base metal and tungsten inert gas welded joints.

Corrosion Behavior of TiSiN Coatings Deposited on Ni-Cr Alloy in Artificial Saliva with and without Fluoride

TiSiN thin films were deposited on NiCr dental alloy in order to enhance the corrosion resistance in artificial saliva with and without fluoride content. The TiSiN films were prepared using reactive cathodic arc method at two different substrate bias voltages (-50 V and-200 V). For the corrosion evaluation, artificial saliva with pH=5.2 was chosen, because this is a critical value for mineral dissolution of dental tissue which can affect the dental alloys. A content of 0.1 % NaF was added to the artificial saliva to simulate the effect of fluoride based hygiene products. The TiSiN coated NiCr alloys exhibited a higher corrosion resistance than the NiCr substrate, irrespective of the testing environment. The best corrosion resistance was found for the TiSiN deposited at-200 V.