X80钢在土壤模拟液中的腐蚀行为研究

Research on the corrosion behaviour of X80 steel in simulative soil solution

在鹰潭和库尔勒土壤模拟液中,利用失重法研究了原始态、正火态和调质状态下的X80管线钢的腐蚀行为,并对原始态试样进行了极化曲线测量。失重试验表明:不同组织的X80钢在鹰潭和库尔勒两种土壤模拟溶液的腐蚀速率随着时间先降低再趋于平稳,都在腐蚀初期出现最大腐蚀速率;X80钢在库尔勒土壤模拟液中的腐蚀速率要高于在鹰潭土壤模拟液中的腐蚀速率。极化曲线表明:原始态X80钢在两种土壤模拟溶液中都属于典型的活性溶解。在库尔勒土壤模拟溶液中,X80钢的自腐蚀电位更负,电流密度大,腐蚀速率高。

The corrosion behaviours of original X80 steel,normalized,quenched and tempered X80 steel in Yingtan and Korla simulative soil solution were studied by weight loss.The polarization curve of original X80 steel in two simulative soil solution was measured.The result of weight loss shows that the corrosion rates of X80 steel samples with different metallographic structure decreases firstly and then tend to steady with time passed by.The peak corrosion rate of these samples takes place in early corrosion stage.The corrosion rate of X80 steel in Yingtan simulative soil solution is lower than that in Korla's.The original X80 steel occurs active dissolve in both of Yingtan and Korla simulative soil solution via the polarization curves.The corrosion rate of X80 steel in Korla simulative soil solution is high due to the more negative corrosion potential and larger corrosion current.