Hot corrosion behavior of Ni–16Cr–xAl based alloys in mixture of Na_2SO_4-NaCl at 600 ℃  

Ni-16Cr-xAl合金在600℃Na_2SO_4-NaCl混合盐中的热腐蚀行为(英文)

作　　者：李维杰[1] 刘咏[1] 王岩[1] 韩朝[1] 汤慧萍[2] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]西北有色金属研究院金属多孔材料国家重点实验室,西安710016

出　　处：《Transactions of Nonferrous Metals Society of China》2011年第12期2617-2625,共9页中国有色金属学报（英文版）

基　　金：Project (2009AA032601) supported by the National High-tech Research and Development Program of China

摘　　要：The hot corrosion behaviors of Ni–16Cr–xAl（x=4.5%, 6.8%, 9.0%, mass fraction） based alloys in Na2SO4–25% NaCl molten salts at 600 °C were investigated. The effects of pre-oxidation and Al content on the resistance to hot corrosion were examined. The hot corrosion resistance of Ni–16Cr–xAl based alloy with Al addition from 4.5% to 9.0% increases with increasing Al content. The alloy with Al content of 9.0% shows the highest hot corrosion resistance among the examined alloys because more β–NiAl phases are obtained to sustain the Al2O3 scale repaired during hot corrosion. Pre-oxidized specimens have a superior hot corrosion resistance compared with the as-cast specimens, due to a protective oxide scale formed after pre-treatment.研究Ni-16Cr-xAl(x=4.5%,6.8%,9.0%)合金在600°CNa2SO4-NaCl混合盐中的热腐蚀行为,分析预氧化及铝含量对合金抗热腐蚀行为的影响。结果表明,随着铝含量由4.5%增加到9.0%(质量分数),Ni-16Cr-xAl(x=4.5%,6.8%,9.0%)合金在Na2SO4-NaCl混合盐中的抗热腐蚀性能提高。因为β-NiAl相的存在能修复热腐蚀中被破坏的Al2O3膜,所以Ni-16Cr-9.0Al合金表现出最优异的抗热腐蚀性能。在预氧化后的样品表面形成了一层具有保护性的氧化膜,其抗热腐蚀性能优于原始态样品的。

关 键 词：Ni–16Cr–xAl based alloys PRE-OXIDATION Na2SO4–25% NaCl mixed salt hot-corrosion mechanism 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG171[金属学及工艺—金属材料]