EFFECT OF PHOSPHORIC SEGREGATION ON THE PITTING IN CARBON STEELS

J Chin Soc Corr Pro

2001, Vol. 21

Issue (4): 193-199 DOI:

Research Report

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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

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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

Received: 13 June 2000

ZTFLH:

TG172.5

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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 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2001/V21/I4/193

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