Accelerating Effect of Pitting Corrosion Products on Metastable Pitting Initiation and the Stable Pitting Growth of 304 Stainless Steel

doi:10.11902/1005.4537.2018.144

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (4): 338-344 DOI: 10.11902/1005.4537.2018.144

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Accelerating Effect of Pitting Corrosion Products on Metastable Pitting Initiation and the Stable Pitting Growth of 304 Stainless Steel

WANG Biao,DU Nan(

),ZHANG Hao,WANG Shuaixing,ZHAO Qing

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

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Abstract

The acceleration effect of the concentration of pitting corrosion products on the metastable pitting initiation and the stable pitting growth of 304 stainless steel was studied by changing the concentration of pitting products on the surface of 304 stainless steel compulsively. There are three characteristic indexes of metastable pitting initiation process with the decreasing concentration of pitting products, namely the increase of pitting incubation period, the reduce of average peak current and average peak width, and the decrease of pits number. The volume and the transverse growth rate of pits decreases. With the decreasing ratio of pits width to depth and the growth of pits, the concentration of pitting products in pits increases again and the corrosion rate increases. The concentration of pitting products is certainly the key factor for metastable pitting initiation and steady pitting growth.

Key words: metastable pitting stable pitting stir potentiostatic polarization

Received: 08 October 2018

ZTFLH:

TG174

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

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

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	Biao WANG
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	Hao ZHANG
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Cite this article:

WANG Biao,DU Nan,ZHANG Hao,WANG Shuaixing,ZHAO Qing. Accelerating Effect of Pitting Corrosion Products on Metastable Pitting Initiation and the Stable Pitting Growth of 304 Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2019, 39(4): 338-344.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2018.144 OR https://www.jcscp.org/EN/Y2019/V39/I4/338

Fig.1 Schematic diagram of the experiment device

Fig.2 Curves of transient current vs time for metastable pits of 304 stainless steel in 3.5%NaCl solution at the stirring rates of 0 r/min (a), 100 r/min (b), 300 r/min (c) and 500 r/min (d)

Fig.3 Relationships between average peak current (a), average peak width (b), number of pits (c) and pitting incubationperiod (d) of metastable pits and stirring rate

Fig.4 Curves of dissolution current vs time for single pit in 3.5%NaCl solution at different stirring rates

Fig.5 Evolutions of the volume of a single stable pit of 304 stainless steel in 3.5%NaCl solution at different stirring rates

Stirring rate r / min	D / μm	d / μm	H / μm	V / μm³	$D H$	$d H$
0	175	103	105	1.61×10⁶	1.67	0.98
100	133	85	90	8.36×10⁵	1.47	0.94
300	125	79	87	7.45×10⁵	1.43	0.90
500	89	62	75	3.54×10⁵	1.18	0.82

Table 1 Geometric parameters of a single pit after polarization at different stirring rates

Fig.6 Evolutions of mouth diameter of a single stable pit of 304 stainless steel in 3.5%NaCl solution at different stirring rates

Fig.7 Images of surface topography and 3D reconstruction of a single stable pit at the stirring rates of 0 r/min (a), 100 r/min (b), 300 r/min (c) and 500 r/min (d)

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