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以Ni-Mo合金为基添加W、Mo等所形成的一种新型合金在强还原性介质中具有良好的耐蚀性。采用金相方法与腐蚀试验方法研究合金的相结构与耐蚀性的关系,确定了合金最佳组成及其良好综合性能,并且讨论了合金元素对其耐腐蚀性能的影响。试验证明,合金经氩弧焊接不发生晶间腐蚀,焊接后无须进行固溶处理,可直接使用。合金在脱O_2后的40％HF溶液中,70℃时的腐蚀速率为0.05～0.07mm/y;在沸腾温度时的腐蚀率≤0.2mm/y。合金在固溶状态下为单相γ固溶体组织,其纵弹性模量(E)为2.009×10~5MPa(20500kgf/mm~2),抗拉强度(σ_b)>7.35×10~2MPa(75kgf/mm~2),延伸率(δ)>35％,杯突值为11～13mm。
A new type of alloy formed by adding W and Mo to Ni-Mo alloy has good corrosion resistance in strong reducing media. The relationship between the phase structure and corrosion resistance of the alloy was studied by metallographic method and corrosion test method, and the best composition and good comprehensive properties of the alloy were determined. The effects of alloying elements on the corrosion resistance were also discussed. Test proved that the alloy by argon arc welding does not occur between the intergranular corrosion, welding without the need for solution treatment, can be used directly. The corrosion rate of alloy in 40% HF solution after de-O_2 is 0.05 ~ 0.07mm / y at 70 ℃; the corrosion rate at the boiling temperature is less than or equal to 0.2mm / y. The results show that the alloy has a single-phase γ solid solution in the solution state, and has a Young’s modulus (E) of 2.009 × 10 -5 MPa (20500 kgf / mm 2) and a tensile strength σ b of 7.35 × 10 -2 MPa (75 kgf / mm ~ 2), elongation (δ)> 35%, cup protrusion value of 11 ~ 13mm.