Corrosion behavior of NiCr alloys in HCl-containing oxidation atmosphere at 700-800℃
来源期刊：中国有色金属学报(英文版)2004年第3期
论文作者：张轲 牛焱 潘太军 吴维tao
文章页码：543 - 549
Key words：NiCr alloy; high temperature corrosion; refuse incineration; chlorination-oxidation; active oxidation
Abstract: Corrosion behaviors of pure Ni and three NiCr alloys were investigated in an HCl-containing oxidizing atmosphere at 700℃and 800℃. All materials suffer from accelerated corrosion at both temperatures. NiCr alloys show an initial mass loss due to the formation of volatile CrCl3and CrO2Cl2. Some chlorides are detected at the scale/substrate in terface and many voids are also found there. NiCr alloys with higher chromium content have better corrosion resistance.However, Ni50Cr is inferior to Ni25Cr due to its two-phase structure, which makes it easy for chlorine to diffuse along grain boundary and to occur inner oxidation. The relevant corrosion mechanism was also discussed.
