Effects of sulfidation of passive film in the presence of SRB on the pitting corrosion behaviors of stainless steels

2009 ◽  
Vol 113 (2-3) ◽  
pp. 971-976 ◽  
Author(s):  
Fushao Li ◽  
Maozhong An ◽  
Guangzhou Liu ◽  
Dongxia Duan
Keyword(s):  
Passive Film ◽  
Pitting Corrosion ◽  
Stainless Steels ◽  
Corrosion Behaviors

scholarly journals Enhancement of Corrosion Properties of Fe-18Cr-9Mn-5.5Ni-0.3(C + N) Austenitic Stainless Steels by Carbon Alloying

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1124
Author(s):  
Daun Byeon ◽  
Heon-Young Ha ◽  
Sung-Dae Kim ◽  
Hyo-Haeng Jo ◽  
JinJong Lee ◽  
...  
Keyword(s):  
Passive Film ◽  
Pitting Corrosion ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Partial Substitution ◽  
Corrosion Properties ◽  
Resistance Level ◽  
Aisi 304 ◽  
Pitting Corrosion Resistance ◽  
C And N

In this study, the resistance to pitting corrosion of Fe-18Cr-9Mn-5.5Ni-0.3(C + N) austenitic stainless steel γ-SSs (in wt%) with different C/(C + N) ratios (0.02, 0.29, and 0.60) was evaluated. It was found to be difficult to form a γ-matrix without precipitation, because the Cr23C6 precipitation rate in the γ-SSs with the C/(C + N) value of 0.60 was too fast. Thus, it was recommended to maintain the C/(C + N) ratio below 0.6 in Fe-18Cr-9Mn-5.5Ni-0.3(C + N) γ-SSs. As a result of the potentiodynamic polarization tests, the γ-SS with a C/(C + N) ratio of 0.29 showed the highest resistance to pitting corrosion, and the resistance level of this alloy was superior to that of the AISI 304 γ-SS. Analysis of the passive film and matrix dissolution rates revealed that a higher C/(C + N) ratio of γ-SS increased the protective ability of the passive film and decreased the growth rate of the pits. Therefore, it could be concluded that partial substitution of C for N was advantageous for improving the pitting corrosion resistance of Fe-18Cr-9Mn-5.5Ni-0.3(C + N) γ-SSs, as long as C and N existed in a solid solution state.

scholarly journals Molybdenum Effects on Pitting Corrosion Resistance of FeCrMnMoNC Austenitic Stainless Steels

Metals ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 653 ◽  
Author(s):  
Heon-Young Ha ◽  
Tae-Ho Lee ◽  
Jee-Hwan Bae ◽  
Dong Chun
Keyword(s):  
Corrosion Resistance ◽  
Passive Film ◽  
Point Defects ◽  
Pitting Corrosion ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Passive State ◽  
Film Resistance ◽  
Pitting Corrosion Resistance ◽  
Mo Content

For Fe-based 18Cr10Mn0.4N0.5C(0–2.17)Mo (in wt %) austenitic stainless steels, effects of Mo on pitting corrosion resistance and the improvement mechanism were investigated. Alloying Mo increased pitting and repassivation potentials and enhanced the passive film resistance by decreasing number of point defects in the film. In addition, Mo reduced critical dissolution rate of the alloys in acidified chloride solutions, and the alloy with higher Mo content could remain in the passive state in stronger acid. Thus, it was concluded that the alloying Mo enhanced pitting corrosion resistance of the alloys through increasing protectiveness of passive film and lowering pit growth rate.

Corrosion Behaviors of Ultrapure Ferritic Stainless Steels in Simulated Urban Refuse Leachate

2011 ◽  
Vol 261-263 ◽  
pp. 749-752
Author(s):  
Li Yan Qin ◽  
Guang Wei Fan ◽  
Fang Hong Xu
Keyword(s):  
Stainless Steel ◽  
Passive Film ◽  
Stainless Steels ◽  
Open Circuit ◽  
Passive State ◽  
Film Stability ◽  
Ferritic Stainless Steels ◽  
Stainless Steel 304 ◽  
Corrosion Behaviors ◽  
Relaxation Curves

The corrosion behaviors of ultrapure ferritic stainless steels in simulated urban refuse leachate were investigated by means of different measurement methods including steady-state polarization curves, potentiostatic open-circuit relaxation curves and scanning electronic microscope. The results show that the ultrapure ferritic stainless steel 443, 444 and the austentic stainless steel 304 maintained good passive state after being immersed in the simulated leachate for 720h. The descending order of pitting resistance is 444>443>304. According to the passive film equivalent resistance Rp and the interface capacitance Cd obtained by fitting the potentiostatic open-circuit relaxation curves, the descending order of passive film stability is also 444>443>304.

scholarly journals The pitting corrosion monitoring of stainless steel in a simulated corrosive condition in marine applications

2018 ◽  
Vol 1 (1) ◽  
pp. Proof
Author(s):  
Thee Chowwanonthapunya
Keyword(s):  
Stainless Steel ◽  
Passive Film ◽  
Pitting Corrosion ◽  
Stainless Steels ◽  
Immersion Time ◽  
Corrosion Monitoring ◽  
Metallurgical Investigation ◽  
Inhibiting Effect ◽  
Acidic Conditions ◽  
Marine Applications

This paper describes the pitting corrosion monitoring of ferritic and austenitic stainless steel under a simulated acidic condition of marine appications. The monitoring deals with the corrosion weight loss and metallurgical investigation. The results indicated that the stainless steel with passive film shows the good corroison resistance to the simulated corrosive environment for the all test periods. In contrast, the stainless steel without passive film cannot provide the inhibiting effect for the whole test periods. After the 24 hr. of testing , both of the stainless steel are locally attacked. Pitting corrosion was observed on the surface of both stainless steels. In small pits, the self-accelerating corrosion can occur. Therefore, the longer immersion time attributes to the higher corrosion rate of both stainless steel in a simulated acidic conditions.

scholarly journals Recent progress on the corrosion behavior of metallic materials in HF solution

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Hailong Dai ◽  
Shouwen Shi ◽  
Lin Yang ◽  
Can Guo ◽  
Xu Chen
Keyword(s):  
Environmental Factors ◽  
Stainless Steels ◽  
Hydrofluoric Acid ◽  
Recent Progress ◽  
Future Research ◽  
Fluoride Ion ◽  
Metallic Materials ◽  
Chemical Coupling ◽  
Corrosion Behaviors ◽  
Corrosion Mechanisms

Abstract Hydrofluoric acid (HF) or fluoride ion corrosion issues are often encountered in many fields, which have attracted extensive research due to its strong corrosiveness. In this paper, a critical review is presented based on recent progress on HF corrosion. In view of the discrepancy of fluoride ion compared with other ions, the special attack characteristics of fluoride ion are firstly discussed. Afterwards, the corrosion mechanisms of stainless steels, nickel-based alloys, and titanium alloys in HF solution or fluoride ion-containing environment are reviewed, and three typical corrosion behaviors are summarized, which are essentially weakening process of passivation of metallic materials. The effects of influencing factors (e.g. alloying elements, environmental factors, and stress, etc.) on HF corrosion are also discussed, which involve changes in passivation mechanism, the influence of HF attack mode and multiple damage mechanisms due to mechanical–chemical coupling. Finally, future research works on HF corrosion are proposed.

Pitting corrosion of stainless steels used in the production of weak nitric acid

1970 ◽  
Vol 6 (2) ◽  
pp. 137-139
Author(s):  
A. N. Kuzyukov ◽  
V. A. Borisenko ◽  
N. P. Pilyugina
Keyword(s):  
Nitric Acid ◽  
Pitting Corrosion ◽  
Stainless Steels
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