褪除液浓度及pH值对电化学法褪除碳化钨-镍涂层工艺的影响
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摘要
对于返修零件的残余涂层及生产中不合格的碳化钨-镍涂层,必须先去除,才能重新喷涂.为有效褪除涂层,又不破坏基体,采用电化学法褪除45号钢表面的碳化钨-镍涂层,通过研究褪除液浓度和pH值对涂层褪除速率及对基体腐蚀情况的影响,确定最优pH值为11～12,褪除液(主要成分酒石酸钾钠和碳酸钠)质量浓度为0.25 kg/L,电流密度为6 A/dm~2.采用此电化学工艺可有效褪除钢基体表面的碳化钨-镍涂层,也不会对钢基体造成影响.
For the residual coatings of the rework parts and unqualified coatings in production must be removed before it can be re-sprayed. In order to effectively remove the coating without destroying the substrate, the WC-Ni coating on the surface of 45 steel was removed by electrochemical method. The effect of stripping powder concentration and pH value of solution on the coating removal rate and the corrosion of the substrate was studied. The process conditions optimized as follows:pH 11-12, stripping powder concentration(mainly composed of sodium citrate and sodium carbonate) 0.25 kg/L. The electrochemical process can effectively remove the tungsten carbide-nickel coating on the surface of steel substrate, and does not affect the steel substrate.
For the residual coatings of the rework parts and unqualified coatings in production must be removed before it can be re-sprayed. In order to effectively remove the coating without destroying the substrate, the WC-Ni coating on the surface of 45 steel was removed by electrochemical method. The effect of stripping powder concentration and pH value of solution on the coating removal rate and the corrosion of the substrate was studied. The process conditions optimized as follows:pH 11-12, stripping powder concentration(mainly composed of sodium citrate and sodium carbonate) 0.25 kg/L. The electrochemical process can effectively remove the tungsten carbide-nickel coating on the surface of steel substrate, and does not affect the steel substrate.
引文
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[4] 陈山.热喷涂涂层在航空修理上的应用[J].航空维修与工程,2003 (6):32-33.
[5] 杜鹏程.超音速火焰喷涂WC-10Ni硬质合金涂层及其水润滑磨损性能研究[D].大连:大连理工大学,2017.
[6] 康忠明,陈志坤.响应曲面设计在碳化钨-钴-铬涂层褪除工艺优化中的应用[J].电镀与涂饰,2018(15):683-686.
[7] 李晗晔,冮冶,刘志强.化学法去除碳化钨-钴涂层的工艺[J].电镀与涂饰,2015(5):269-271.