气体渗氮35CrMo钢的耐蚀行为

材料热处理学报, 2011, 32(12): 143-146.

气体渗氮35CrMo钢的耐蚀行为

王炳英 ^1, , 孙振铜 ^2, , 蒋文春 ^3, , 侯振波 ^4,

1.中国石油大学（华东）机电工程学院,山东青岛266555

2.中国石油大学（华东）机电工程学院,山东青岛266555

3.中国石油大学（华东）机电工程学院,山东青岛266555

4.中国石油大学（华东）机电工程学院,山东青岛266555

基金项目: 中央高校基本科研业务费专项资金资助项目(09CX04041A) 山东省自然科学基金(Y2008F38)

关键词： 35CrMo钢 , 气体渗氮 , 极化 , CO2腐蚀

Corrosion behavior of 35CrMo steel after gas nitriding

Keywords： 35CrMo steel , gas nitriding , polarization , CO2 corrosion

用氨气作为渗剂,对35 CrMo钢进行不同时间的气体渗氮处理。借助光学显微镜和显微硬度计分别进行了渗氮层的微观组织观察和硬度测试,利用M398电化学综合测试系统测试了动电位极化曲线,并在高温高压反应釜中进行了CO2腐蚀行为的研究,利用SEM、EDS和XRD分析了腐蚀产物膜的结构和相组成。结果表明：35 CrMo钢经过气体渗氮后自腐蚀电位正移,自腐蚀电流密度下降;CO2高温高压模拟实验条件下,渗氮后平均腐蚀速度降低,腐蚀产物膜由致密、完整的晶体状FeCO3构成,有效降低35 CrMo钢的腐蚀速率。

Gas nitriding treatment was conducted on 35CrMo steel for different time using ammonia as nitriding agent.Microstructure and microhardness of the nitrided layer were examined by optical microscope and microhardness tester.Petentiodynamic polarization curves were measured on a corrosion integrated test system,CO2 corrosion behavior of 35CrMo steel with and without nitriding was studied in a high-pressure reactor.The characteristics of CO2 corrosion scales on 35CrMo steel were investigated by means of SEM,EDS and XRD.The results indicate that the gas nitriding treatment led to an increase of self-corrosion potential and a reduction of corrosion current density of the 35CrMo steel.The reduction of average corrosion rate of 35CrMo steel after nitriding treatment is attributed to the formation of the compact FeCO3 corrosion scale.

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