Effect of Fe3+ on Pitting Corrosion of Stainless Steel in Simulated Seawater

doi:10.11902/1005.4537.2019.145

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (6): 517-522 DOI: 10.11902/1005.4537.2019.145

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Effect of Fe³⁺ on Pitting Corrosion of Stainless Steel in Simulated Seawater

ZHANG Hao, DU Nan(

), ZHOU Wenjie, WANG Shuaixing, ZHAO Qing

National Defense Key Discipline Laboratory of Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, China

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Abstract

The corrosion behavior of 304 stainless steel in acidic FeCl₃ solution was studied by linear sweep voltammetry and cyclic voltammetry. The results show that the free-corrosion potential of 304 stainless steel shifts positively and the free-corrosion current density increases with the increase of Fe³⁺ concentration at the same pH and Cl^- concentration. When 304 stainless steel is corroded in acidic Fe³⁺ solution, the free-corrosion potential of stainless steel is positively shifted due to the presence of Fe³⁺ reduction reaction, which makes it difficult for H⁺ reduction reaction to carry out on the electrode surface. When Fe³⁺ content is sufficient, the cathodic reaction in stainless steel corrosion process is mainly Fe³⁺ reduction reaction, not H⁺depolarization reaction. Therefore, it should be fully considered the effect of Fe³⁺ on pits growth in the study of pitting corrosion behavior of stainless steel.

Key words: 304 stainless steel pitting corrosion cyclic voltammetry linear sweep voltammetry Fe³⁺ reduction reaction

Received: 10 September 2019

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(51561024)

Corresponding Authors: DU Nan E-mail: d_nan@sina.com

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Cite this article:

ZHANG Hao, DU Nan, ZHOU Wenjie, WANG Shuaixing, ZHAO Qing. Effect of Fe³⁺ on Pitting Corrosion of Stainless Steel in Simulated Seawater. Journal of Chinese Society for Corrosion and protection, 2020, 40(6): 517-522.

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https://www.jcscp.org/EN/10.11902/1005.4537.2019.145 OR https://www.jcscp.org/EN/Y2020/V40/I6/517

Table 1 Compositions and pH values of test solutions

Fig.1 Potentiodynamic polarization curves of 304 stainless steel in the solutions with different concentrations of Fe³⁺ (pH=1.64, $C C l -$ =0.3 mol/L)

$C F e 3 +$ / mol/L	E_corr / mV	I_corr / μA·cm^-2
0.001	-329.1	0.42
0.010	-119.1	0.73
0.025	-65.4	1.79
0.100	65.5	14.91

Table 2 Fitting results of potentiodynamic polarization curves of 304 stainless steel in the solutions with different concentrations of Fe³⁺

Fig.2 Corrosion morphologies of 304 stainless steel after polarization in 0.001 mol/L (a), 0.010 mol/L (b), 0.025 mol/L (c) and 0.100 mol/L (d) Fe³⁺ solutions (pH=1.64, $C C l -$ =0.3 mol/L)

Fig.3 Cyclic voltammetry curves of GCE in 0.100 mol/L FeCl₃ solution

Fig.4 Potentiodynamic polarization curves of 304 stainless steel in 0.100 mol/L FeCl₃ solution and 0.100 mol/L FeCl₂ solution

Fig.5 Diagram of pit growth

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