微量Cl~-对316L不锈钢在沸腾乙酸—甲酸混合介质中的腐蚀行为的影响

中国腐蚀与防护学报

1988, Vol. 8

Issue (3): 199-206

研究报告

本期目录 | 过刊浏览

微量Cl~-对316L不锈钢在沸腾乙酸—甲酸混合介质中的腐蚀行为的影响

左禹

北京化工学院

EFFECT OF TRACE Cl~- ON CORROSION BEHAVIOR OF 316L SS IN BOILING ACETIC ACIDFORMIC ACID MIXTURE

Zuo Yu(Beijing Institute of Chemical Technology)

全文: PDF(1007 KB)

摘要: 通过腐蚀失重测量、极化曲线测试和AES分析,研究了微量Cl~-对316L不锈钢在沸腾的84％乙酸—10％甲酸—6％水中的腐蚀行为的影响。结果表明,微量Cl~-(50ppm)的吸附对316L的活性溶解有抑制作用。Cl~-浓度再高则腐蚀速度增大。316L在阳极极化时呈现钝化行为,阳极钝化膜富铬、贫铁,Cl~-使钝化膜的铬、铁含量降低,铬/铁比也降低,从而氧/(铬+铁)比升高,膜的保护性能降低,一定条件下可诱发孔蚀。常温下恒电位阳极极化使Cl~-在表面吸附并进入钝化膜内,温度升高则吸附作用减弱。

Abstract：Effect of trace Cl~- on corrosion behavior of 316L SS in boiling 84％ acetic acid-10% formic acid-6％ water mixture is investigated by weight loss, polarization measurement and AES tests. Trace Cl~-(50ppm) has a slight inhibition effect on the anodic dissolution of the material because of its adsorption on the surface, but corrosion rate increases when the concentration of Cl~- increases to 200 ppm. Anodic passivation region is found on the anodic polarization curve and the passive film formed on the surface is enriched in Cr and O but depleted in Fe and Ni. The addition of Cl~- decreases the content of Cr and the Cr/Fe ratio in the film, and thus increases the O/(Cr+Fe) ratio. Then the protective effect of the passive film decreases and pitting incurs.

收稿日期: 1988-06-25

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引用本文:

左禹. 微量Cl~-对316L不锈钢在沸腾乙酸—甲酸混合介质中的腐蚀行为的影响[J]. 中国腐蚀与防护学报, 1988, 8(3): 199-206.
. EFFECT OF TRACE Cl~- ON CORROSION BEHAVIOR OF 316L SS IN BOILING ACETIC ACIDFORMIC ACID MIXTURE. J Chin Soc Corr Pro, 1988, 8(3): 199-206.

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https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y1988/V8/I3/199

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