Evaluation of the corrosion protection properties of multilayer Cu/Ni/Cr deposits |
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| Affiliation: | 1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, PR China;2. Hubei Guoan Special Steel Company, Huangshi, 435000, PR China;3. Patent Examination Cooperation Hubei Center of the Patent Office, Wuhan, 430040, PR China;4. Wuhan Second Ship Design and Research Institute, Wuhan, 430205, PR China;1. State Key Laboratory for Mechanical Behavior of Materials, Xi''an Jiaotong University, Xi''an 710049, China;2. National Key Laboratory for Vessel Integrated Power System Technology, Naval University of Engineering, Wuhan 430033, China;1. Heilongjiang Key Lab of Disaster Prevention Mitigation and Protection Engineering, Northeast Petroleum University, No. 199 Development Road of Daqing High-tech Development Zone, Daqing City, China;2. Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics China Earthquake Administration, 29 Xuefu Road, Nangang District, Harbin City, China;3. China Northeast Architectural Design & Research Institute Co., Ltd, 65 Guangrong Street, Heping District, Shenyang City, China |
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| Abstract: | Investigations of multilayer Ni/Cr deposits with conventional and with microporous chromium, in some cases incorporating bright copper sublayers, are reported.The microporosity of the chromium deposit is determined by the Dubpernell test. The polarity, the potential differences and the thicknesses of the individual nickel deposits are determined using the simultaneous thickness and electrochemical potential (STEP) test. Accelerated corrosion determinations are carried out using the Corrodkote method.The superposition of the duplex nickel (semibright nickel (SBNi) or bright nickel (BNi) and nickel seal (Nis)), microporous chromium and bright copper (BCu) sublayer on nickel strike (Nistr) in the system Nistr(2 μm)/ BCu(20 μm)/SBNi(9 – 12 μm)/Nis(3 – 5 μm)/Cr(0.3 μm) leads to the formation of multilayer protective and/or decorative plates with the best corrosion protection properties.It is possible to use the fast STEP test in combination with the Dubpernell method to forecast the corrosion behaviour of multilayer Cu/Ni/Cr deposits. |
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