EFFECT OF TEMPERATURE AND CONCENTRATION RATIO ON PITTING RESISTANCE OF 316L STAINLESS STEEL IN SEAWATER

doi:10.3724/SP.J.1037.2013.00314

Acta Metall Sin

2014, Vol. 50

Issue (3): 373-378 DOI: 10.3724/SP.J.1037.2013.00314

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EFFECT OF TEMPERATURE AND CONCENTRATION RATIO ON PITTING RESISTANCE OF 316L STAINLESS STEEL IN SEAWATER

XIN Sensen^1,², LI Moucheng^1,²(

), SHEN Jianian^1,²

1 Institute of Materials, Shanghai University, Shanghai 200072
2 Laboratory for Microstructure, Shanghai University, Shanghai 200444

Cite this article:

XIN Sensen, LI Moucheng, SHEN Jianian. EFFECT OF TEMPERATURE AND CONCENTRATION RATIO ON PITTING RESISTANCE OF 316L STAINLESS STEEL IN SEAWATER. Acta Metall Sin, 2014, 50(3): 373-378.

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Abstract

Due to a serious shortage of natural fresh water in many areas all over the world, the seawater desalination has emerged as an effective compensation way to meet the consumption requirements. Due to the good corrosion resistance and low cost, stainless steels have been used extensively to construct the multi effect distillation (MED) plants, especially type 316L stainless steel for the evaporation chambers. However, with the application and development of low temperature MED, there is increasingly need of higher temperature distillation and higher brine concentration in the desalinators to reduce the drainage of hot brine and increase the water production ratio, which may cause more serious corrosion on the stainless steel components in the plants. Pitting corrosion of 316L stainless steel was studied in the concentrated environments of seawater with different temperatures (25, 50, 63, 72, 85 and 95 ℃) and concentration ratios (1, 1.5, 2, 2.5 and 3 times) by using cyclic anodic polarization measurement and SEM surface observation. The results show that both pitting potential and repassivation potential of 316L stainless steel decrease linearly with temperature in the concentration ratio range of 1 to 3 times for seawater, but the change of pitting potential is very slight when the solution temperature is higher than 85 ℃ in the case of concentration ratio larger than 2 times. Both pitting potential and repassivation potential reduce linearly with the logarithm of the concentration ratio of seawater in the range of 25 to 95 ℃. It is apparent that increasing temperature and concentration ratio of seawater will deteriorate the pitting resistance of 316L stainless steel noticeably. The influence of temperature and concentration ratio is analyzed on the basis of the point defect model. Nevertheless, the concentration ratio of seawater has a weaker influence on pitting resistance of 316L stainless steel in comparison with temperature as revealed by the pitting potential changes resulted from the concentration ratio around 1.5 times and solution temperature around 72 ℃. Therefore, compared with temperature, the corrosion resistance of 316L stainless steel for low temperature MED plants may be relatively tolerant of the adjustment or fluctuation of seawater concentration.

Key words: stainless steel pitting corrosion concentrated seawater temperature

Received: 07 June 2013

ZTFLH:

TG 172

Fund: Supported by National Natural Science Foundation of China (No.51134010)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00314 OR https://www.ams.org.cn/EN/Y2014/V50/I3/373

Fig.1

不同温度下在浓缩度为1.5倍的海水中316L不锈钢的循环阳极极化曲线

Fig.2

316L不锈钢在1.5倍浓缩海水中72 ^oC下阳极极化后的点蚀形貌

Fig.3

不同浓缩度下316L不锈钢的点蚀电位E_P和再钝化电位E_R与溶液温度的关系曲线

表1 点蚀电位和再钝化电位与温度间的线性拟合结果

Fig.4

316L不锈钢在72 ℃下不同浓缩度海水中的循环阳极极化曲线

Fig.5

不同温度下316L不锈钢的E_p和E_R与海水浓缩度的关系曲线

表2 点蚀电位和再钝化电位与海水浓缩度对数间线性拟合结果

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