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采用真空电弧熔炼工艺制备了Cr_xCuFe_2Mo_(0.5)Nb_(0.5)Ni_2(x为Cr与Cu的摩尔比,分别为0、0.5、1.0、2.0)高熵合金,研究了合金在1mol/L H_2SO_4溶液中的耐腐蚀性能,并与S304不锈钢进行了比较。结果表明,合金中x=1.0或x=2.0时的腐蚀速率约为0.07mm/y,远低于x=0或x=0.5的合金及S304不锈钢,合金中x=0或x=0.5的腐蚀类型主要是沿晶腐蚀,而x=1.0或x=2.0的合金腐蚀类型主要是均匀腐蚀和点状腐蚀。x=0或x=0.5的合金中Cu、Nb、Mo的偏析程度较大,而x=1.0或x=2.0的合金中各元素分布相对均匀,因此原电池腐蚀程度相对较弱。极化腐蚀表明,x=2.0的合金具有最好的耐酸蚀性能,平均腐蚀速率仅为0.02mm/h,为S304不锈钢腐蚀速率的4%左右。
The Cr_xCuFe_2Mo_ (0.5) Nb_ (0.5) Ni_2 (x is the molar ratio of Cr to Cu, 0,0.5,1.0,2.0 respectively) was prepared by vacuum arc melting process. The effects of the alloy in 1mol / L H_2SO_4 solution The corrosion resistance and compared with S304 stainless steel. The results show that the corrosion rate of alloy is about 0.07mm / y at x = 1.0 or x = 2.0, much lower than that of x = 0 or x = 0.5 alloy and S304 stainless steel with x = 0 or x = 0.5 The type is mainly intergranular corrosion, and the alloy corrosion types of x = 1.0 or x = 2.0 are mainly the uniform corrosion and the pitting corrosion. The segregation degree of Cu, Nb and Mo in the alloy with x = 0 or x = 0.5 is relatively large, and the distribution of each element in the alloy with x = 1.0 or x = 2.0 is relatively uniform, so the corrosion degree of the primary battery is relatively weak. Polarization corrosion indicates that the alloy with x = 2.0 has the best acid corrosion resistance with an average corrosion rate of only 0.02 mm / h, which is about 4% of the corrosion rate of S304 stainless steel.