金属材料在盐湖卤水中的腐蚀研究

CORROSION OF METALLIC MATERIALS IN THE BRINE OF CHAERHAN SALT LAKE

采用极化曲线测量、腐蚀电位测量和现场暴露试验等方法研究了典型金属材料在盐湖卤水中的电化学特性和腐蚀行为。在卤水中,Q235和16Mn的腐蚀速度受阴极氧扩散控制,腐蚀较轻。304和430不锈钢在卤水中有较轻的蚀斑和缝隙腐蚀。在卤水中T2、QSi3-1的腐蚀速度受阴极活化控制,表面腐蚀均匀,且有低的腐蚀率。L6和LF6在卤水中处于活化态。暴露181d,L6和LF6发生严重的点蚀和缝隙腐蚀。

Electrochemical characters and corrosion behaviors of typical metal materials in the brine of Chaerhan salt lake of China were studied by measuring corrosion potentials and polarization curves and performing field exposure tests. In the brine, corrosion rate of Q235 and 16Mn was relatively low and controlled by oxygen diffusion rate on the cathode. 304 and 430 stainless steels exposed to field brine suffered light pitting and crevice corrosion. Corrosion rate of T2, QSi3-1 in the brine was low and controlled by cathodic activation polarization, and their corrosion was uniform. L6 and LF6 immersed in the brine were in active state and showed serious pitting and crevice corrosion after exposed for 181d.