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利用模拟闭塞电池测出“1Cr3钢/Cl~-”体系闭塞区不同阶段的化学变化,并在不同阶段的模拟闭塞区溶液中测1Cr13钢的腐蚀串和极化曲线等,绘制出描述该体系闭塞电池腐蚀行为的实验电位/pH图。由“腐蚀率/pH”曲线和电位/pH图都表明该体系存在一个闭塞电池加速腐蚀的临界pH值。约为3.7。当闭塞区溶液的pH值降到临界值以下时,1Cr13钢孔底或缝尖的腐蚀率骤增。其原因是闭塞区内发生了“钝态/活态”转变,并开始放氢反应。
The chemical changes of the occlusion zone of “1Cr3 steel / Cl ~ -” system were measured by simulated occluded cells and the corrosion series and polarization curves of 1Cr13 steel were measured in the solution of simulated occlusion zone at different stages. Experimental Potentials / pH Charts of Cell Corrosion Behavior at Blocking. The “corrosion rate / pH” curve and potential / pH plots show that there is a critical pH value for accelerated corrosion of the system. About 3.7. When the occlusion zone solution pH dropped below the critical value, 1Cr13 steel hole bottom or tip sharp increase in corrosion rate. The reason is that a “passive / live” transition has taken place in the occluded area and the hydrogen evolution reaction begins.