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研究了690合金在硼酸缓冲液中的腐蚀行为。结果表明,在该溶液中690合金的极化曲线发生二次钝化,且Cl-浓度越高发生自腐蚀的电位越低、电流密度越大。合金在动电位极化后表面出现沿晶腐蚀的形貌特征。当溶液温度升高时,690合金的自腐蚀电位和点蚀电位降低,钝化膜变得更加不稳定。
The corrosion behavior of 690 alloy in boric acid buffer was studied. The results show that the polarization curve of the 690 alloy undergoes secondary passivation in this solution. The lower the potential of self-corrosion occurs, the higher the current density is. The morphology of intergranular corrosion appears on the surface of the alloy after the polarization of the moving potential. When the solution temperature increases, the corrosion resistance and pitting potential of 690 alloy decrease, and the passivation film becomes more unstable.