Effects of Cu, Mo and C on the corrosion of deformed 18Cr8Ni stainless steels in H2SO4/NaCl solutions

Ogura, Shin-ichiro; Sugimoto, Katsuhisa; Sawada, Yoshinobu

doi:10.1016/0010-938x(76)90118-9

Cited by 32 publications

(8 citation statements)

References 4 publications

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“…This generates insoluble salts or hydroxides that hinder contact between the metallic surface and the electrolyte in the pit with a consequent decrease in the corrosion rate associated with increased R T . The present results accord with those reported by Ougura et al [25], who observed a threshold maximum corrosion rate at a concentration of ca. 0.2 M Cl ) for the alloys (18Cr-9Ni-0.01Cu-xMo), x varied from 0.13 to 1.03 wt%.…”

Section: Eis Measurementssupporting

confidence: 94%

Stability of spontaneous passive films on high strength Mo-containing stainless steels in aqueous solutions

2007

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The stability of naturally grown passive films on some Mo-containing stainless steel specimens was examined in aerated and deaerated universal buffer solutions with different pH (2-12) as well as in sulphate and chloride solutions. Open circuit potential (E oc ) and electrochemical impedance spectroscopy (EIS) were used as measuring techniques. In all cases, E oc shifts towards less negative values with time until the potential reaches its steady-state (E ss ) value. The E ss value is found to be more positive with decrease in solution pH or increase in Mo content in the alloy and becomes less positive in deaerated buffer solutions. Also, the thickening rate of the outer layer for the duplex passive film increases with increasing extent of Mo in the steel substrate or pH of the test solution. For a given alloy, E ss decreases linearly with the anion concentration (C), and is always more positive in Cl ) than in SO 4 2) media for C ‡ 0.05 M. Analysis of the EIS data showed that the total resistance (R T ) of the passive film has higher values in aerated solutions, and is generally lower in basic solutions. This indicates that lower solution pH favours the formation of oxide films offering better protection. Furthermore, the higher values of R T in Na 2 SO 4 solutions suggest the formation of more stable passive films in sulphate than in chloride solutions. This is discussed on the basis of the relative degree of anion incorporation into the passive films.

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Section: Eis Measurementssupporting

confidence: 94%

Stability of spontaneous passive films on high strength Mo-containing stainless steels in aqueous solutions

2007

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“…The favourable influence of Cu on R T value confirms the results of the potentiodynamic polarization measurements. In all solutions, Cu seems to have a positive influence on the resistance to general corrosion in agreement with the results in acid chloride and addition of 2 % Cu decreased the corrosion sharply [33,34] By comparing R T values given in Table 2 (e) for the only studied steel bearing Mn, i.e. alloy VII with that for steel VI having the nearest composition to it and containing no Mn, it can be seen that no significant change occurs in the R T value under all conditions, suggesting that any negative effect on the corrosion resistance due to Mn addition can be balanced by the positive influence due to increase in the level of Mo, Ni and N. For a family of austenitic stainless steels containing Mo additions in the range 0 to 7.5 % with lower Mn content (<0.5 %), Brigham and Tozer [35] found a large and synergistic improvement in resistance.…”

Section: Impedance Measurementssupporting

confidence: 89%

Electrochemical behaviour of Mo‐containing austenitic stainless steels in buffer solution

Heakal

Ameer

El-Aziz

et al. 2004

Materialwissenschaft Werkst

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The effect of pH on the electrochemical behavior of austenitic stainless steels in naturally aerated and nitrogen-deaerated buffer solutions has been studied.Potentiodynamic and ac impedance techniques were used. The results indicate that corrosion current (I corr ) decreases with pH. By examining the impedance data for the seven tested steels under various conditions, it seems that the total resistance (R T ) value is a suitable indication parameter for explaining the role of molybdenum and the other supplementary alloying additions (Ni, N, Cu and Mn) on the passive film behaviors as a function of pH of the forming solutions. As a general trend, the R T values for all steels tended to be lower in the basic buffer than in the acidic solutions.

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“…Many previous works have displayed the corrosion or passive behaviour of stainless steel in a variety of environments. Ogura indicated that the addition of 0.1–1.0 wt% of Cu to austenitic stainless steel could cause a decrease of its corrosion rate in 5 N H 2 SO 4 /NaC1 solutions. Vernau reported that copper always increases stainless steel corrosion resistance in acid media, although its influence depends on the oxidizing strength of the solution.…”

Section: Introductionmentioning

confidence: 99%

The influence of Cu on the electrochemical behaviour of 304 stainless steel in 0.1M H₃PO₄ solution

Luo

Dong

et al. 2012

Surface & Interface Analysis

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The effect of different Cu addition on the electrochemical and passivation behaviour of the 304 series stainless steel in 0.1 M phosphoric acid solution was evaluated by the potentiodynamic measurements and electrochemical impedance spectrum (EIS). The effect of Cu on chemical composition of the passive film formed in the solution was also studied by X-ray photoelectron spectroscopy (XPS). The results indicated that Cu did not appreciably improve the corrosion resistance of the passive film, but enhanced the passivation, lowered the critical and passive current density. The passive and critical current density decreased with Cu content increased. The presence of Cu in the passive film affects passive film stability. Cu can modify the proportion of Cr element in the passive film, and also change the components of Fe in the passive film.

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Effects of Cu, Mo and C on the corrosion of deformed 18Cr8Ni stainless steels in H2SO4/NaCl solutions

Cited by 32 publications

References 4 publications

Stability of spontaneous passive films on high strength Mo-containing stainless steels in aqueous solutions

Stability of spontaneous passive films on high strength Mo-containing stainless steels in aqueous solutions

Electrochemical behaviour of Mo‐containing austenitic stainless steels in buffer solution

The influence of Cu on the electrochemical behaviour of 304 stainless steel in 0.1M H₃PO₄ solution

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Effects of Cu, Mo and C on the corrosion of deformed 18Cr8Ni stainless steels in H2SO4/NaCl solutions

Cited by 32 publications

References 4 publications

Stability of spontaneous passive films on high strength Mo-containing stainless steels in aqueous solutions

Stability of spontaneous passive films on high strength Mo-containing stainless steels in aqueous solutions

Electrochemical behaviour of Mo‐containing austenitic stainless steels in buffer solution

The influence of Cu on the electrochemical behaviour of 304 stainless steel in 0.1M H3PO4 solution

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The influence of Cu on the electrochemical behaviour of 304 stainless steel in 0.1M H₃PO₄ solution