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Effect of Several Alloying Elements on Electrochemical Corrosion Behavior of a Novel Superalloy Co-Al-W Super Alloy

Yangtao Xu, Tiandong Xia, Jianqiang Yan

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Abstract

Corrosion behavior of novel Co-Al-W superalloy with addition of several alloying elements was investigated.The results showed that the addition of Mo,Nb,Ta and Ti could improve the corrosion resistance of the alloy in NaCl solution.The alloy-2Mo showed superior corrosion resistance compared to alloys-2Nb and 2Ta,while the alloy-2Ti was the worst.In NaCl solutions with different pH value,Co-Al-W alloys suffered from serious pitting corrosion which mainly located at grain boundaries.The pitting corrosion was attributed to the migration of Cl~- into the pits from solution.

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What this paper is about

Corrosion behavior of novel Co-Al-W superalloy with addition of several alloying elements was investigated.The results showed that the addition of Mo,Nb,Ta and Ti could improve the corrosion resistance of the alloy in NaCl solution.The alloy-2Mo showed superior corrosion resistance compared to alloys-2Nb and 2Ta,while the alloy-2Ti was the worst.In NaCl solutions with different pH value,Co-Al-W alloys suffered from serious pitting corrosion which mainly located at grain boundaries.The pitting corrosion was attributed to the migration of Cl~- into the pits from solution.

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Available abstract

Corrosion behavior of novel Co-Al-W superalloy with addition of several alloying elements was investigated.The results showed that the addition of Mo,Nb,Ta and Ti could improve the corrosion resistance of the alloy in NaCl solution.The alloy-2Mo showed superior corrosion resistance compared to alloys-2Nb and 2Ta,while the alloy-2Ti was the worst.In NaCl solutions with different pH value,Co-Al-W alloys suffered from serious pitting corrosion which mainly located at grain boundaries.The pitting corrosion was attributed to the migration of Cl~- into the pits from solution.

Key concepts: Materials science, Corrosion, Alloy, Metallurgy, Superalloy, Pitting corrosion, Grain boundary, Electrochemistry

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