Effect of pH on Pitting Corrosion Process of 304 Stainless Steel in 3.5%NaCl Solution

doi:10.11902/1005.4537.2013.259

Journal of Chinese Society for Corrosion and protection

2015, Vol. 35

Issue (1): 38-42 DOI: 10.11902/1005.4537.2013.259

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Effect of pH on Pitting Corrosion Process of 304 Stainless Steel in 3.5%NaCl Solution

YE Chao¹, DU Nan¹(

), TIAN Wenming², ZHAO Qing¹, ZHU Li³

1. Key Discipline Laboratory of National Defence of Light Alloy Processing Science and Technology Institute, Nanchang Hangkong University, Nanchang 330063, China
2. School of Materials Science and Engineering, Beihang University, Beijing 100191, China
3. Department of AVIC Chengdu Manufacturing Engineering, Chengdu 610092, China

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Abstract

Effect of pH values on pitting dynamics and morphology of single pits of 304 stainless steel in 3.5%NaCl solution was studied by means of potentiostatic polarization and 3-dimensional video microscope. The results showed that the pitting current, the growth rate of pit volume, the pit depth and pit mouth diameter of single pits increase with the decreasing pH in a range 1 to 14 by applied potential of 0.15 V_vs_SCE. In solutions with the same pH, the growth rate of pit depth increases with time, while the growth rate of pit mouth diameter decreases with time. In solutions with different pH, the growth of single pit is controlled by the diffusion through corrosion products. There exists lacy cover on the wall of pit mouth, and the integrity of the lacy cover declines with the increase of pH.

Key words: 304 stainless steel pH pitting dynamics corrosion morphology diffusion controlled

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	Chao YE
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Cite this article:

YE Chao, DU Nan, TIAN Wenming, ZHAO Qing, ZHU Li. Effect of pH on Pitting Corrosion Process of 304 Stainless Steel in 3.5%NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2015, 35(1): 38-42.

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https://www.jcscp.org/EN/10.11902/1005.4537.2013.259 OR https://www.jcscp.org/EN/Y2015/V35/I1/38

Fig.1 Curves of dissolution current and time for single pit formed on 304 stainless steel in 3.5%NaCl solution at different pH

Table 1 Parameters of single pit after polarization at different pH

Fig.2 Curves of pit volume vs time for single pit of 304 stainless steel in 3.5%NaCl solution at different pH

Fig.3 Curves of pit depth (a) and mouth diameter (b) vs time for single pit of 304 stainless steel in 3.5%NaCl solution at different pH

Fig.4 Curves of dissolution current density vs time for single pit of 304 stainless steel in 3.5%NaCl solution at different pH

Fig.5 Images of metal cover on the pit mouth for 304 stainless steel in 3.5%NaCl solution with pH=1 (a), pH=4 (b), pH=7 (c), pH=10 (d) and pH=14 (e)

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