A100钢低氢脆刷镀镉镀层海洋环境腐蚀行为研究

Corrosion Behaviour of Low Hydrogen Brittleness Brush Plating Cadmium on A100 Steel in Marine Environment

通过海洋环境下的户外暴露实验研究了A100钢表面低氢脆刷镀镉的腐蚀行为及腐蚀对力学性能的影响。通过腐蚀动力学曲线反映了镀层腐蚀失重的变化,并利用交流阻抗技术表征了镀层在不同腐蚀阶段的特征。结果表明:镀层具有很好的耐腐蚀性能,但随着实验的进行腐蚀速率逐渐加快;腐蚀对镀层力学试样的力学性能影响很大,导致抗拉强度降低,断口呈氢脆断裂。

The corrosion behaviour of low hydrogen brittleness brush plating cadmium on A100 steel was investigated under the outdoor exposure environments in Hainan. The corrosion dynamics curve reflects the change of the coating corrosion weightlessness. The features for the various corrosion sta- ges were characterized by the electrochemical impedance spectroscopy, and the effect of corrosion on the mechanical properties was also discussed. The results indicate that the brush plating cadmium has a good corrosion resistance, corrosion rate increase with exposure time. The mechanical properties are obviously effected by corrosion and the corrosion leads to tensile strength decrease. The microstructure of test specimens presents a brittle fracture characteristic.