Galvanic Corrosion Behavior between Titanium Alloy and HighStrength Alloys
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摘要: 采用电偶腐蚀实验方法、扫描电镜和能谱方法等研究了高强合金与钛合金异接电偶腐蚀行为.从不同材料、不同成分对电偶腐蚀的影响,研究了电偶腐蚀的规律及电偶对偶接的可能性.同时比较了铝合金和高强度钢与钛合金电偶腐蚀行为的差异,探讨了自腐蚀电位差与电偶电流密度的关系.实验表明,铝合金LY12、铝合金LC4、高强度钢30CrMnSiA均不能与TC2钛合金偶接,高强度钢1Cr17Ni2则可以与TC2偶接,且电偶电流密度随自腐蚀电位差增大而增大.Abstract: Galvanic corrosion between titanium alloy TC2 and two aluminum alloys (LY12,LC4) and two high-strength steels (30CrMnSiA,1Cr17Ni2) were investigated by galvanic corrosion testing,SEM and DES. The difference of galvanic corrosion behavior of two aluminum alloys and of galvanic corrosion behavior of two high-strength steels were analyzed. On the above basis,the rule of galvanic corrosion between titanium alloy and high-strength alloys was studied. By comparing the galvanic corrosion behavior of aluminum alloys with that of high-strength steels,the relationship between differential value of open circuit potentials and the value of galvanic corrosion current density was discussed. It was concluded that the galvanic couple of 1Cr17Ni2-TC2 can be available, but the galvanic couples of LY12-TC2,LC4-TC2 and 30CrMnSiA-TC2 should be avoided.
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Key words:
- titanium alloys /
- aluminum alloys /
- high-strength steels /
- galvanic corrosion
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