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采用静态浸泡腐蚀实验、电化学分析方法等研究连续定向凝固方法制备的具有连续柱状晶组织的Cu-12%Al(质量分数,下同)合金在3.5%NaCl(质量分数)溶液和10%HCl(体积分数)溶液中的耐腐蚀性能及腐蚀机理。结果表明:Cu-12%Al合金在3.5%NaCl溶液中的耐腐蚀性能可达到耐蚀级。虽然在40℃以下的10%HCl溶液中该合金的耐腐蚀性能可达到耐蚀级,但在40℃以上的10%HCl溶液中的耐腐蚀性能欠佳。连续柱状晶组织Cu-12%Al合金的耐腐蚀性能优于Al含量为5%~11%的传统铝青铜和QBe2合金的耐腐蚀性能,但劣于QBe2.15合金的耐腐蚀性能。在3.5%NaCl溶液和10%HCl中连续柱状晶组织Cu-12%Al合金的自腐蚀电位分别为-271 mV(vs SCE)和-333 mV(vs SCE)。腐蚀发生后试样表面的Al元素含量明显下降,腐蚀机制为脱铝腐蚀。
The Cu-12% Al (mass fraction, the same below) alloy with continuous columnar crystal structure prepared by the continuous directional solidification method in 3.5% NaCl (mass fraction) solution and 10% HCl (Volume fraction) solution of corrosion resistance and corrosion mechanism. The results show that the corrosion resistance of Cu-12% Al alloy in 3.5% NaCl solution can reach corrosion resistance. Although the corrosion resistance of the alloy reaches its corrosion resistance in a 10% HCl solution below 40 ° C, its corrosion resistance is poor in a 10% HCl solution above 40 ° C. The corrosion resistance of continuous columnar crystal Cu-12% Al alloy is better than the corrosion resistance of conventional aluminum bronze and QBe2 alloy with 5% ~ 11% Al content, but inferior to the corrosion resistance of QBe2.15 alloy. The self-corrosion potentials of Cu-12% Al alloy with continuous columnar grain structure in 3.5% NaCl solution and 10% HCl were -271 mV vs -333 mV vs-SCE, respectively. After the occurrence of corrosion, the content of Al element in the sample surface obviously drops, and the corrosion mechanism is dealumination corrosion.