氢渗透电流法监测海洋大气中钢材的腐蚀速率

用Devnathan-Stachurski双电解池技术,对16Mn钢表面干湿循环时氢渗透现象进行了研究,结果表明不同表面液膜下,都有氢渗透电流的存在.氢离子渗透量与试样腐蚀失重之间存在线性关系.利用此线性关系制作的实时监测氢渗透电流的传感器,用以记录实际海洋大气中氢渗透电流,并根据氢离子渗透量与腐蚀失重之间的线性关系对海洋大气中钢材的腐蚀速率进行预测.结果表明,实际海洋大气中,氢渗透电流与环境湿度存在着对应关系,环境湿度由大变小时,氢渗透电流由小变大.环境湿度交替变化,在试样表面完成干湿循环,促进了氢的渗透,实际海洋大气与摸拟海洋大气失重取得了较好的一致性.可以用氢渗透电流传感器实时监测海洋用钢在大气中的氢渗透情况及腐蚀失重情况.

Monitoring of corrosion rate of steels in marine atmosphere by hydrogen permeation current investigation

Hydrogen permeation of 16Mn steel under cyclic wet-dry conditions was investigated by Devnathan-Stachurski’s electrolytic cell with a membrane covered on the exit side by a nickel layer and the weight loss was measured for each wet-dry cycle.Results show that the hydrogen permeation current density changes with the test solutions.A clear linear correlation exists between the quantities of hydrogen permeated through the specimen and the weight loss.Using the self-developed sensor,the hydrogen permeation current and corrosion weight loss can be measured and predicted.The corrosion weight loss was also measured using seperatespecimens.As a result,the two weight loss results show good coherences and are almost on the same linear ship.This method can be used to predict the hydrogen permeation and the weight loss of steels.