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研究了20％Cr的Fe-Ni-Cr-Mo系合金在30～45％Ni,8～14％Mo范围变化时,其阳极极化行为和耐氯化物腐蚀性能。试验表明:合金的钝化能力主要取决于在1NHCl中阳极极化曲线中的临界电流密度Ic值,决定Ic值的主要因素则是合金基体中的实际Mo含量,而Ni含量对Ic值影响不大。第二相对合金耐氯化物腐蚀性能有很不利的影响,因此,适当调正合金中的Ni,Mo含量的配比以得到单相奥氏体组织是很重要的。试验表明:合金内部组织的微小变化,尽管在合金的阳极极化行为上没有表现,但决不意味对合金的耐氯化物腐蚀性能不发生影响。判断合金的耐氯化物腐蚀性能,其极化行为是重要的依据,但不是唯一的依据。
The anodic polarization and chloride corrosion resistance of 20% Cr Fe-Ni-Cr-Mo alloys were investigated in the range of 30% -45% Ni and 8% -14% Mo. The experimental results show that the passivation ability of the alloy mainly depends on the critical current density Ic in the anodic polarization curve of 1NHCl. The main factor determining the Ic value is the actual Mo content in the alloy matrix, while the Ni content has no effect on the Ic value Big. The second relative alloy has a very adverse effect on chloride corrosion resistance. Therefore, it is very important to properly adjust the ratio of Ni and Mo in the alloy to obtain the single-phase austenite structure. Experiments show that the slight variation of the internal structure of the alloy, though not exhibited in the anodic polarization behavior of the alloy, does not in any way imply that the corrosion resistance of the alloy to chloride is unaffected. Judgment of alloy chloride corrosion resistance, the polarization behavior is an important basis, but not the only basis.