耐候钢表面稳定锈层形成机理的研究

FORMATION MECHANISM OF PROTECTIVE RUST ON WEATHERING STEEL

研究了耐候钢在青岛近海大气中曝晒 3a的腐蚀行为 ,观察测定了锈层与基体的界面形貌、相组成及锈层中合金元素的分布 .结果表明 ,腐蚀 3a的耐候钢表面锈层有明显的分层现象 ;内锈层组织致密 ,主要有各向同性的α-FeOOH构成 ,在偏光下检测消光 ;外锈层有γ—FeOOH和Fe2 O3 构成 ,在偏光下检测炫光 ;

Corrosion rate of carbon steel and the weathering steel in the marine atmosphere by Qingdao for 3 years was compared,and the distribution of the alloy elements in the rust layer was determined. The result shows that the structure of corrosion rust of weathering steel exposed for 3 years consisted of inner layer and outer layer obviously. The former was compacted and composed of α-FeOOH mainly, and looked dark by the polarized light. However, the latter is of γ-FeOOH and a little FeO, and appeared bright by the polarized light.