论文部分内容阅读
与粉末冶金法(PM)制备的常规尺寸合金对比,研究了通过热压液相还原法(LPR)和机械合金化法(MA)合成的Cu-50Ag合金粉末制备的块体纳米晶Cu-50Ag合金在酸性溶液中的腐蚀行为。结果表明:在Na_2SO_4溶液中加入H_2SO_4后,3种合金的腐蚀速度均加快。随着H_2SO_4浓度的增加,PMCu-50Ag和LPRCu-50Ag合金的腐蚀速度均未发生明显变化,而MACu-50Ag合金的腐蚀速度则加快。在Na_2SO_4溶液中,3种合金均未出现钝化现象,随着H_2SO_4的加入,合金出现了钝化现象。3种合金的腐蚀速率按PMCu-50Ag,LPRCu-50Ag和MACu-50Ag合金的顺序增加,其中LPRCu-50Ag合金的腐蚀速度略大于PMCu-50Ag合金,但明显小于MACu-50Ag合金。
Compared with conventional size alloys prepared by powder metallurgy (PM), the bulk nanocrystalline Cu-50Ag prepared by Cu-50Ag alloy powders synthesized by hot-press liquid phase reduction (LPR) and mechanical alloying Corrosion Behavior of Alloys in Acidic Solution. The results show that the corrosion rate of all three alloys increases with the addition of H_2SO_4 to Na_2SO_4 solution. With the increase of H 2 SO 4 concentration, the corrosion rate of PMCu-50Ag and LPRCu-50Ag alloy did not change significantly, while the corrosion rate of MACu-50Ag alloy accelerated. In Na_2SO_4 solution, the passivation of the three alloys did not appear. With the addition of H_2SO_4, the passivation of the alloy appeared. The corrosion rates of the three alloys increase in the order of PMCu-50Ag, LPRCu-50Ag and MACu-50Ag alloys. The corrosion rate of LPRCu-50Ag alloy is slightly higher than that of PMCu-50Ag alloy, but significantly lower than that of MACu-50Ag alloy.