Study on hydrogen permeation and stress corrosion cracking behaviors of AISI 4135 high-strength steel with macrofouling adhesion in marine immersion zone
作者
单位
1CAS Key Laboratory of Marine Environmental Corrosion and Bio-fouling、Institute of Oceanology、Chinese Academy of Sciences、Qingdao 266071、P. R. China 2University of Chinese Academy of Sciences、Beijing 100049、P. R. China 3Center for Ocean Mega-Science、Chinese Academy of Sciences、7 Nanhai Road、Qingdao、266071、P. R. China
关键词
收录来源
International Corrosion Congress · 第22届国际腐蚀大会
摘要
Macrofouling adhesion can increase the hydrogen permeation and SCC sensitivity of high -strength steels, but related research needs to be refined. A field exposure test was set up to study the ef fect of macrofouling adhesion on hydrogen permeation and stress corrosion cracking (SCC) behaviors of a high -strength steel in marine immersion zone, and the results were further verified by laboratory electrochemical simulation tests. The results indicated that the crevices formed by macrofouling adhesion ( Fig. 1) can promote localized corrosion pits and change the local chemical environment on the surface of high-strength steel under natural corrosion and cathodic protection state. More severe localized corrosion can increase the hydrogen permeation current density and promote the SCC of high -strength steel under natural corrosion state. As a comparison, the hydrogen permeation current density of steel under cathodic protection state was slightly decrease d owing to the shielding effect of macrofouling. Meanwhile, the macrofouling increases the SCC sensitivity of high-strength steel under cathodic protection state by promoting localized corrosion.