(1. 兰州理工大学 有色金属新材料国家重点实验室, 兰州 730050;
2. 甘肃省水利水电工程局, 兰州 730000)
摘 要: 通过静态浸泡腐蚀实验、 电化学实验、 X射线衍射分析、 扫描电镜、 电子能谱仪、 电子探针等方法研究高铝青铜合金Cu-14Al-X在3.5%NaCl(质量分数)溶液中的耐蚀性能及腐蚀行为。 结果表明: 在NaCl溶液中, Cu-14Al-X合金具有良好的耐蚀性能, 合金中的(α+γ2)共析体和β′ 相、 α相、 K相相比, 具有优先腐蚀倾向, 合金发生的主要是脱铝腐蚀。 腐蚀钝化膜的形成及热处理后合金各相成分趋于一致, 均使合金耐腐蚀性能得到改善。
关键字: 铝青铜; 腐蚀; 耐蚀性能; 腐蚀速率; 脱铝
( 1. State Key Laboratory of Advanced Nonferrous Materials,
Lanzhou University of Technology, Lanzhou 730050, China;
2. Gansu Province Conservancy and Hydro-power Engineering Bureau,
Lanzhou 730000, China)
Abstract: The corrosion resistance and behavior of Cu-14Al-X bronze in 3.5%NaCl (mass fraction) solution was investigated by using static immersing corrosion and electrochemistry test, X-ray diffractrometry, scanning electron microscope, energy dispersive spectrometer and electron probe micro-analyzer. The results indicate that the corrosion resistance of Cu-14Al-X is perfect in 3.5%NaCl solution. (α+γ2) phase suffers a dealuminization attack superior to β′ phase, α phase and K phase, the high Al-bronze suffers dealuminization corrosion. And the passivation patinas and the composition of each phases becoming more homogeneous are moderator to corrosion.
Key words: aluminum bronze; corrosion; corrosion resistance; corrosion rate; dealuminization