纯Cr和两种含Cr合金在ZnCl2及KCl-ZnCl2盐膜下的腐蚀

中国腐蚀与防护学报

2002, Vol. 22

Issue (1): 27-31

研究报告

本期目录 | 过刊浏览

纯Cr和两种含Cr合金在ZnCl2及KCl-ZnCl2盐膜下的腐蚀

李远士;牛焱;吴维tao

大连理工大学材料系

CORROSION BEHAVIOR OF PURE Cr AND TWO Cr-CONTAINING ALLOYS BENEATH ZnCl2 AND KCl-ZnCl2 DEPOSITS

Yuanshi Li;Yan Niu;Weitao Wu

大连理工大学材料系

全文: PDF(217 KB)

摘要: 研究了纯Cr、低合金钢及HP型耐热钢在450℃纯氧气氛中分别于ZnCl2和KCl-ZnCl2盐膜下的腐蚀.结果表明，材料在混合盐膜下比在单一ZnCl2 盐膜下发生了更严重的腐蚀.与低合金钢相比，纯Cr和耐热合金中的腐蚀产物更为疏松并易剥落.此外，HP耐热合金中还沿富Cr碳化物发生了晶间侵蚀.从热力学角度讨论了形成Cr2O 3型保护膜的材料在含氯环境中的蜕化机理.

关键词 ： Cr, 低合金钢, 耐热钢, KCl, ZnCl2, 腐蚀

Abstract：The corrosion behavior of pure Cr，one low alloy st eel and an HP-type heat-resistant steel were studied in the presence of ZnCl2 and KCl-ZnCl2 deposits respectively in oxidizing gaseous environments at 450℃ .All materials suffered from seriously accelerated corrosion beneath mixture sal ts than in single ZnCl2 deposit.The oxide scales formed on pure Cr and heat-re sistant steel were easily to spall and had even worse adherence to the matrix co mpared with that on low alloy steel，whereas the latter had a higher mass gain d uri ng corrosion.Furthermore，Cr-rich Cr7C3 carbides were attacked preferentiall y induced by chlorine in comparison to the matrix of the heat resistant steel.Th e results show that the Cr-containing alloys do not exhibit excellent corrosion resistance to this chlorine-contaminant environment due to the poor adherence of the scales to the matrix.The accelerated corrosion mechanism for those Cr2O 3-forming materials is discussed thermodynamically.

Key words： Cr low alloy steel heat-resistant steel ZnCl 2 KCl corrosion

收稿日期: 2000-08-20

ZTFLH:

TG174.44

通讯作者: 李远士

Corresponding author: Yuanshi Li

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引用本文:

李远士; 牛焱; 吴维tao . 纯Cr和两种含Cr合金在ZnCl2及KCl-ZnCl2盐膜下的腐蚀[J]. 中国腐蚀与防护学报, 2002, 22(1): 27-31 .
Yuanshi Li, Yan Niu, Weitao Wu. CORROSION BEHAVIOR OF PURE Cr AND TWO Cr-CONTAINING ALLOYS BENEATH ZnCl2 AND KCl-ZnCl2 DEPOSITS. J Chin Soc Corr Pro, 2002, 22(1): 27-31 .

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https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2002/V22/I1/27

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