| ZHOU Guang-bo,PENG Xiang-gui,CHEN Jia-hui,LIU Yong-yong.Pulse Electroplating Nickel-Cobalt Alloy Process for Optoelectronic Device Shell and Its Corrosion Resistance[J],49(4):356-363 |
| Pulse Electroplating Nickel-Cobalt Alloy Process for Optoelectronic Device Shell and Its Corrosion Resistance |
| Received:August 13, 2019 Revised:April 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.04.042 |
| KeyWord:pulse electroplating Ni-Co alloy nickel sulfamate electroplating process optoelectronics devices shell corrosion resistance |
| Author | Institution |
| ZHOU Guang-bo |
China Electronic Technology Group Chongqing Acousitc-Optic-Electric Co, Ltd, Chongqing , China |
| PENG Xiang-gui |
China Electronic Technology Group Chongqing Acousitc-Optic-Electric Co, Ltd, Chongqing , China |
| CHEN Jia-hui |
China Electronic Technology Group Chongqing Acousitc-Optic-Electric Co, Ltd, Chongqing , China |
| LIU Yong-yong |
China Electronic Technology Group Chongqing Acousitc-Optic-Electric Co, Ltd, Chongqing , China |
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| Abstract: |
| The work aims to develop a pulse electroplating nickel-cobalt alloy process and study the corrosion resistance of the prepared coating, so as to apply such process in the electroplating field of optoelectronic device shell. Pulse electroplating was used to obtain electroplated nickel-cobalt alloy coating, the corrosion resistance of the coating was investigated by corrosion weight loss experiment, polarization curve test and electrochemical impedance spectroscopy test, and the surface morphology, composition and crystal structure of the coating were characterized by field emission scanning electron microscopy, energy spectrometer and X-ray diffractometer. Then, the process was compared with the traditional electroplating nickel sulfamate process in corrosion resistance. Under the corresponding process conditions of optimal corrosion resistance, the nickel-cobalt alloy electroplating was carried out to a certain type of optoelectronic device shell of the company and a series of assessments were carried out on the coating of the product. As the Co content increased, the crystal of the pulse electroplated nickel-cobalt alloy coating was more uniform and dense with smaller grain and coating porosity. In 3.5%NaCl solution, as the Co content increased, the self-corrosion potential of the pulse-plated nickel-cobalt alloy coating was positively shifted, the self-corrosion current density was lowered, and the charge transfer resistance was increased. The self-corrosion potential and the self-corrosion current density of the pulse-plated nickel-cobalt alloy coating with a Co content of 25% were respectively -331 mV and 2.26 μA/cm2, and the charge transfer resistance was 212.62 kΩ. The assessment on coating quality, lead coating strength and lead fatigue of the products met the relevant standards. The corrosion resistance of the pulsed electroplated nickel-cobalt alloy coating increases with the increase of the Co content. In the 3.5% NaCl solution, the self-corrosion current of the Ni-Co (25%) coating is only 44% of that of the Ni coating. The pulse electroplating nickel-cobalt alloy process developed can be applied to the electroplating field of optoelectronic devices shell. |
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