【作者】 吴红艳； 杜林秀； 刘相华；

【Author】 Wu Hongyan;Du Linxiu;Liu Xianghua;State Key Lab of Rolling and Automation, Northeastern University;

【机构】 轧制技术及连轧自动化国家重点实验室,东北大学；

【摘要】 在模拟工业大气环境下,利用干湿交替加速腐蚀方法和电化学实验方法研究了实验钢的耐腐蚀行为。结果表明,Mn-Cu耐候钢的腐蚀速度与SPA-H钢相当但低于16Mn钢。在实验初期腐蚀速度随循环次数的增加而增大,细晶粒耐候钢比粗晶粒腐蚀速度快;在后期随循环次数的增加而减小,粗细晶粒耐候钢腐蚀速度一致。Mn-Cu耐候钢锈内锈层致密,由α-FeO OH和少量γ-Fe2O3组成。16Mn钢锈层由α-FeO OH、γ-Fe2O3和Fe3O4组成。电化学实验表明,腐蚀产物促进阴极过程,抑制阳极过程。细晶粒有利于保护性内锈层的快速形成,其电极化曲线的自腐蚀电位和自腐蚀电流变化较大。更多还原

【Abstract】 It showed that corrosion rate of weathering steel was near to SPA-H steel and lower than that of 16 Mn steel. The corrosion rate increased with increasing the wet / dry cycles in the initial stage of the test, and corrosion rate of fine grained weathering steel was faster than that of coarse grain. However it decreased with increasing the wet / dry cycles in the latter stage of the test, and corrosion rate of all Mn-Cu weathering steel was the same in the latter. Inner rust layer of weathering steel was dense and mainly composed of α-FeO OH and a little of γ-Fe2O3 composition. Rust layer of 16 Mn steel was composed of α-FeO OH, γ-Fe2O3 and Fe3O4 composition. The polarization behavior of the rusted steel indicated that the corrosion product promoted the cathodic process while restrained the anodic process. Fine grain was in favor of the rapid formation of protective rust layer, and the change of corrosion potential and corrosion current of fine grain weathering steel in polarization curve was bigger.更多还原