| CAI Lei,MA Ze-xian,LIU Xin-kuan,SHENG Rong-sheng,LEI Xue-song,FANG Feng.Influence of Electroplating Process on Internal Stress of Nickel Coating in Sulfamate System[J],50(2):347-354 |
| Influence of Electroplating Process on Internal Stress of Nickel Coating in Sulfamate System |
| Received:August 12, 2020 Revised:January 07, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.02.037 |
| KeyWord:nickel plating, double anode-cathode bending, internal stress, nickel sulfamate, magnetic field, ultrasonic |
| Author | Institution |
| CAI Lei |
Sunnywell China New Material Technology Co., Ltd, Changzhou , China |
| MA Ze-xian |
School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai , China |
| LIU Xin-kuan |
School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai , China |
| SHENG Rong-sheng |
Sunnywell China New Material Technology Co., Ltd, Changzhou , China |
| LEI Xue-song |
Sunnywell China New Material Technology Co., Ltd, Changzhou , China |
| FANG Feng |
School of Science and Technology, Southeast University, Nanjing , China |
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| Abstract: |
| In order to explore the influence of various electroplating process parameters on the internal stress of the coating in the sulfamate electroplating system, a modified double anode-cathode bending method is used to test the coating stress. X-ray diffraction experiment (XRD), scanning electron microscope (SEM) and KEYENCE digital microscope system were used to analyze the coating texture, micro distortion and coating morphology under stress. The results show that the greater the current density, the greater the tensile stress of the coating. When the current density reaches 15 A/dm2, the tensile stress value of the coating remains unchanged with the increase the current density. The longer the electroplating time, the thicker the coating and the greater the tensile stress value. After 15 minutes of electroplating, the coating stress remains unchanged. The higher the Cl‒ is, The larger the tensile stress of the coating is. The influence of current density on tensile stress is more significant than the length of plating time. Full spectrum fitting of X-ray diffraction shows that the addition of a magnetic field will inhibit the formation of Ni(111) texture, have a preferential orientation to Ni(200), and at the same time make the microscopic distortion of crystal grains smaller. The stronger the magnetic field, the smaller the stress. Ultrasonic cavitation has no obvious effect on the texture, but it will reduce the microscopic distortion of the crystal grains and reduce the tensile stress of the coating. In conslusion, in the nickel sulfamate system, the increase in current density, electroplating time and Cl‒ concentration will significantly increase the tensile stress. The addition of magnetic field and ultrasound reduces the internal stress of the coating while refining the crystal grains. |
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