碳钢中磷的偏析对坑孔腐蚀的影响

中国腐蚀与防护学报

2001, Vol. 21

Issue (4): 193-199

研究报告

本期目录 | 过刊浏览

碳钢中磷的偏析对坑孔腐蚀的影响

陈学群;常万顺;孔小东

武汉市海军工程大学金工教研室

EFFECT OF PHOSPHORIC SEGREGATION ON THE PITTING IN CARBON STEELS

Xuequn Chen;Wanshun Chang;Xiaodong Kong

武汉市海军工程大学金工教研室

全文: PDF(235 KB)

摘要: 选择五种具有不同冶金特点的碳钢，通过模拟蚀孔的闭塞腐蚀电池试验及室内挂片试验，研究了轧制钢板中磷偏析对坑孔腐蚀扩展的影响.结果表明，磷偏析是形成蚀坑内梯田状腐蚀形态的主要原因；磷偏析及较低的磷含量都加速蚀坑的扩展；沿轧向延伸的磷偏析带及夹杂物导致了蚀坑沿平行板面方向的腐蚀扩展速度大于垂直方向的扩展速度.

关键词 ：碳钢, 孔蚀, 磷偏析

Abstract：Using OCC simulative test and indoor exposure test,the effect of pho sphoric segregation on pitting propagation of five rolling carbon steels with d ifferent metallurgical feature has been studied.The results showed that the pho sphoric segregation was the main cause of forming stair-shape corrosion on the wall of pits.Due to smaller corrosion inhibition of lower phosphoric zone in st eel and its quicker dissolution,phosphoric segregation and lower phosphorus con tent accelerated propagation of the pit.The extension of phosphoric segregation and inclusions along the rolling direction resulted in higher dissolving speed in the direction which was parallel to the plate surface than that in the direct ion which was vertical to.Consequently,the caliber of pits in carbon steels was generally larger than its depth.Exposure conditions had important effect on the action of phosphoric segregation.The effect of phosphoric segregation in a lternating immersion with dry and wet was stronger than that in stirring immersi on ,and that in quiet immersion was the weakest.The stronger oxygen depolarizat ion (i.e.more positive corrosion potential ) and the formation of typical rust tubercle (i.e.acid active region ) were the favorable conditions which enable p hosphoric segregation to act.

Key words： carbon steel pitting phosphoric segregation

收稿日期: 2000-06-13

ZTFLH:

TG172.5

通讯作者: 陈学群

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引用本文:

陈学群; 常万顺; 孔小东 . 碳钢中磷的偏析对坑孔腐蚀的影响[J]. 中国腐蚀与防护学报, 2001, 21(4): 193-199 .
Xuequn Chen, Wanshun Chang, Xiaodong Kong. EFFECT OF PHOSPHORIC SEGREGATION ON THE PITTING IN CARBON STEELS. J Chin Soc Corr Pro, 2001, 21(4): 193-199 .

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2001/V21/I4/193

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