双稀土处理液对H62黄铜成膜耐蚀性能的影响
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摘要
为了提高H62黄铜合金的表面性能,通过正交试验获得了最佳镧、铈双稀土处理液配方。利用硝酸点滴、中性盐雾试验评价了H62黄铜合金钝化膜的耐蚀性能,通过电子探针(EPMA)观测了其表面形态结构及元素分布,利用电化学方法表征了H62黄铜表面钝化膜在3.5%NaCl溶液中的缓蚀行为,采用XRD对H62黄铜表面钝化膜的成分进行了检测。结果表明:H62黄铜合金由镧、铈双稀土处理液钝化成膜的主要成分为Cu2O,CeO_2,La(OH)_3,Ce(OH)_4;致密的钝化膜耐硝酸点滴时间达到21.98 s,在3.5%NaCl溶液自腐蚀电位增加,腐蚀电流降低,腐蚀速度明显降低,耐蚀性能增加,耐中性盐雾性能明显优于镧单一稀土处理液。
In order to improve the surface properties of H62 copper alloys,the formula of double rare earth salt solution was obtained by orthogonal test. The corrosion resistance of H62 copper alloy was evaluated by nitric acid drop and neutral salt spray test,and the surface morphology and elemental analysis were observed by electron probe( EPMA). The corrosion inhibition behavior of the copper alloy specimens in 3.5% Na Cl solution was characterized by electrochemical method,and the composition of the copper alloy surface conversion film was examined by X-ray diffractometer. Results showed that the main components of the film layer on the copper alloy treated by the double rare earth salts were Cu_2O,CeO_2,La( OH)_3 and Ce( OH)4. The passivation film was dense,and the time of the resistance to nitric acid reached21.98 s. The double rare earth conversion coating improved the self-corrosion potential in 3. 5% Na Cl solution,and the corrosion current decreased and the corrosion rate consequently decreased significantly. Besides,the neutral salt spray resistance of the coating by the double rare earth treatment was significantly better than that of the coating treated by the single rare earth salt.
In order to improve the surface properties of H62 copper alloys,the formula of double rare earth salt solution was obtained by orthogonal test. The corrosion resistance of H62 copper alloy was evaluated by nitric acid drop and neutral salt spray test,and the surface morphology and elemental analysis were observed by electron probe( EPMA). The corrosion inhibition behavior of the copper alloy specimens in 3.5% Na Cl solution was characterized by electrochemical method,and the composition of the copper alloy surface conversion film was examined by X-ray diffractometer. Results showed that the main components of the film layer on the copper alloy treated by the double rare earth salts were Cu_2O,CeO_2,La( OH)_3 and Ce( OH)4. The passivation film was dense,and the time of the resistance to nitric acid reached21.98 s. The double rare earth conversion coating improved the self-corrosion potential in 3. 5% Na Cl solution,and the corrosion current decreased and the corrosion rate consequently decreased significantly. Besides,the neutral salt spray resistance of the coating by the double rare earth treatment was significantly better than that of the coating treated by the single rare earth salt.
引文
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[12]VILLAMIL R F V,CORDEIRO G G O,MATOS J,et al.Effect of sodium dodecylsulfate and benzotriazole on the interfacial behavior of Cu/Cu(II),H2SO4[J].Materials Chemistry and Physics,2003,78:448-452.
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[14]朱艳华.变价稀土---钼酸盐协同缓蚀体系的制备及其相关机理研究[D].成都:西南石油大学,2014:71-78.
[2]罗宏.微合金化对黄铜的组织及性能影响[D].济南:济南大学,2015:25-54.
[3]SINGH R N.Effects of Ta,La and Nd additions on the corrosion behavior of aluminum bronze in mineral acids[J].JAppl Electrochem,1992,22(12):1 175-1 179.
[4]郑伟.紫铜表面新型无铬转化膜的成膜工艺及耐蚀性能研究[D].合肥:合肥工业大学,2012:20-24.
[5]刘贵昌.燃气冷凝器表面耐蚀材料的制备及腐蚀行为研究[D].大连:大连理工大学,2013:15-18.
[6]方景礼.铜及铜合金制件的化学抛光[J].电镀与涂饰,2005(10):41-46.
[7]甘树坤,吕雪飞.铜合金表面硝酸镧稀土钝化膜的性能研究[J].材料保护,2008,41(8):35-37.
[8]陈伟,邹松华,李吉丹.紫铜表面环保型钝化工艺研究[J].航天制造技术,2014(1):30-33.
[9]SHIM S I,PARK Y S,KIM S T,et al.Effects of rare earth metal addition on the cavitation erosion-corrosion resistance of super duplex stainless steels[J].Metals and Materials International,2002,8(3):301-307.
[10]GB 10124-88,金属材料试验室均匀腐蚀全浸试验方法[S].
[11]吕雪飞.H62铜合金稀土钝化膜制备及性能研究[D].大连:大连理工大学,2006:14-17.
[12]VILLAMIL R F V,CORDEIRO G G O,MATOS J,et al.Effect of sodium dodecylsulfate and benzotriazole on the interfacial behavior of Cu/Cu(II),H2SO4[J].Materials Chemistry and Physics,2003,78:448-452.
[13]樊良伟.镧盐型缓蚀剂对Cu-Zn-Ni铜合金在3.5%Na Cl溶液中的缓蚀作用[J].腐蚀与防护,2013(1):36-41.
[14]朱艳华.变价稀土---钼酸盐协同缓蚀体系的制备及其相关机理研究[D].成都:西南石油大学,2014:71-78.