耐候钢表面稳定化处理及锈层结构研究

Surface Stabilization and Rust Structure of Weathering Steel

针对免涂装耐候钢使用过程中暴露出的锈液流挂问题,设计了一种耐候钢锈层稳定化处理液,并对稳定化处理后的耐候钢进行了半年的大气暴晒实验。分析了耐候钢稳定锈层形成过程中,锈层的结构及演化行为。腐蚀动力学曲线结果表明:耐候钢表面锈层经过4个阶段逐渐达到稳定状态,每个阶段的增(失)重均呈线性变化。锈层中Cu、Cr富集提高了锈层电化学保护性能,缩短了稳定化进程。

Aiming at the problem of emerging traces of fluid flow containing rust products on the surface of the bare weathering steel during real service in atmosphere,a stabilizing treatment solution for the weathering steel was designed,and after stabilization treatment,the weathering steel was exposed in a real atmosphere for 0.5 a.The evolution process of the forming rust layer on the weathering steel was monitored and characterized.The corrosion kinetic curve shows that the weight variation of weathering steel gradually reaches a stable state through four stages,and the mass gain(loss)of each stage changes linearly.The enrichment of Cu and Cr in the rust increases the electrochemical protectiveness of the rust layer,reduces the corrosion rate and shortens the stabilization process of the bare weathering steel.