Effect of Temperature on Initiation of Metastable Pits and Geometric Features of Stable Pits for 304 Stainless Steel

doi:10.11902/1005.4537.2016.009

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (2): 135-141 DOI: 10.11902/1005.4537.2016.009

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Effect of Temperature on Initiation of Metastable Pits and Geometric Features of Stable Pits for 304 Stainless Steel

Yingjun AI¹,Nan DU¹(

),Qing ZHAO¹,Shixin HUANG¹,Liqiang WANG²,Qingjie WEN²

1 National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, China
2 Department of Manufacture Engineering, Chengdu Aircraft Lndustrial (Group) Co., Ltd., Chengdu 610092, China

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Abstract

Effect of temperature on pitting behavior and corrosion morphology of 304 stainless steel in 3.5%NaCl solution was studied by means of potentiostatic polarization, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and three-dimensional video microscope. The results showed that as the temperature increased from 20 ℃ to 40 ℃, the initiation period of metastable pits shortened, the number the nuclei formed per unit time increased, the average peak-current and the average peak-width (which could represent the lifetime of metastable pits) increased, therefore, the increasing number of metastable pits led to higher probability for the occurrence of stable pits. The growth rate of pitting current, pit volume, pit mouth diameter and pit depth of single pit increased with the increasing temperature by applied potential of 0.15 V(vs SCE). The growth rate of pit mouth diameter and pit depth gradully decreased with the extension of time at the same temperature. The corrosion pit was incompletely covered by lace-like corrosion products, and of which the integrity decreased with the increase of temperature.

Key words: 304 stainless steel temperature metastable pit stable pit dynamics

Received: 08 January 2016

Fund: Supported by National Natural Science Foundation of China (51561024)

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	Yingjun AI
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	Qing ZHAO
	Shixin HUANG
	Liqiang WANG
	Qingjie WEN

Cite this article:

Yingjun AI,Nan DU,Qing ZHAO,Shixin HUANG,Liqiang WANG,Qingjie WEN. Effect of Temperature on Initiation of Metastable Pits and Geometric Features of Stable Pits for 304 Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2017, 37(2): 135-141.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.009 OR https://www.jcscp.org/EN/Y2017/V37/I2/135

Fig.1 Curves of transient current vs time for metastable pits of 304 stainless steel in 3.5%NaCl solution at all test temperatures (a) and only 20 ℃ (b)

Table 1 Parameters about initiation of metastable pitting at different temperatures

Fig.2 Dynamic potential polarization curves of 304 stainless steel during immersion in 3.5%NaCl solution at different temperatures

Table 2 Fitting data of polarization curves for 304 stainless steel in 3.5%NaCl solution at different temperatures

Fig.3 Nyquist plots of 304 stainless steel in 3.5%NaCl solution at different temperatures

Fig.4 Equivalent circuit diagram for EIS of 304 stainless steel in 3.5%NaCl solution at different temperatures

Table 3 Fitting data of EIS of 304 stainless steel in 3.5%NaCl solution at different temperatures

Fig.5 Curves of dissolution current vs time for single pit of 304 stainless steel in 3.5%NaCl solution at different temperatures

Fig.6 Fitted results of dissolution current vs time curves for single pit of 304 stainless steel in 3.5%NaCl solution at 20 ℃ (a), 30 ℃ (b) and 40 ℃ (C)

Table 4 Geometrical parameters of single pit after polarization at different temperatures

Fig.7 Evolutions of pit volume (a), mouth diameter (b) and pit depth (c) of single pit of 304 stainless steel in 3.5%NaCl solution at different temperatures

Fig.8 Pit corrosion morphologies of 304 stainless steel in 3.5%NaCl solution at 20 ℃ (a), 30 ℃ (b) and 40 ℃ (c)

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