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连续柱状晶组织Cu-12%Al合金在3.5%NaCl和10%HCl溶液中的腐蚀行为 被引量:5

Corrosion behavior of continuous columnar-grained Cu-12%Al alloy in 3.5%NaCl and 10%HCl solutions
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摘要 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%A1(质量分数,下同)合金在3.5%NaCl(质量分数)溶液和10%HCI(体积分数)溶液中的耐腐蚀性能及腐蚀机理。结果表明:Cu-12%A1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%A1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0Be2.15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%A1合金的自腐蚀电位分别为-271mV(vsSCE)和-333mV(VSSCE)。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 corrosion resistances and corrosion mechanism of a Cu-12%Al (mass fraction) alloy with continuous columnar-grained (CCG) microstructure fabricated by unidirectional solidification casting were investigated by static immersing tests and electrochemistry analysis in 3.5%NaC1 (mass fraction) and 10%HC1 (volume fraction) solutions. The results show that the corrosion resistances of the CCG Cu-12%A1 alloy in 3.5%NaCl solution can achieve corrosion- resistant level. The corrosion resistances in 10%HCl solution at a temperature below 40 ℃ can achieve corrosion-resistant level, however, if the temperature is above 40 ℃, the alloy has poor corrosion resistance in 10%HCl solution. In 10%HC1 solution, the corrosion resistance of the CCG Cu-12%A1 alloy is superior to that of the conventional Al bronzes with Al content of 5%-11% and QBe2 alloy, but inferior to that of QBe2.15 alloy. The corrosion potentials of the CCG Cu-12%Al alloy are -271 mV (vs SCE) in 3.5%NaCl and -333 mV (vs SCE) in 10%HCl. The content of Al in the surface layer of the alloy significantly decreases after corrosion, which proves that the Cu-12%A1 alloy suffers dealuminization corrosion in 3.5%NaC1 and 10%HCl solutions.
出处 《中国有色金属学报》 EI CAS CSCD 北大核心 2012年第9期2469-2476,共8页 The Chinese Journal of Nonferrous Metals
基金 国家重点基础研究发展计划资助项目(2011CB606300) 国家自然科学基金资助项目(51104015) 国家“十二五”科技支撑计划资助项目(2011BAE23B00) 中央高校基本科研业务费资助项目(FRF-TP-10-002B)
关键词 Cu-12%Al合金 连续柱状晶组织 耐腐蚀性能 脱铝腐蚀 Cu-12%Al alloy continuous columnar-grained microstructure corrosion resistance dealuminizationcorrosion
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