The influences of co-deposited Ti particles on corrosion behavior of electrodeposited Ni-Ti coatings were investigated. The co-deposited Ti particles caused the refined crystallite size and random-oriented texture of Ni-Ti coating. In 3.5 wt% sodium chloride (NaCl) solution, the buried Ti particles in Ni matrix blocked the corrosion path and rapid intercrystalline corrosion. The inert TiO2 could form on the exposed Ti particles and hinder localized corrosion. In 10 wt% sodium hydroxide (NaOH) solution, Ni matrix crystallites, refined by co-deposited Ti particles, contributed to formation of the passive Ni(OH)2 film. The corrosion current of Ni-Ti coating decreased by about one order of magnitude in both solutions with respect to pure Ni coating, demonstrating the co-deposited Ti particles greatly improved the corrosion resistance of Ni-Ti composite coatings. Finally, a corrosion mechanism was built to explain the co-deposited Ti particles improved corrosion resistance of the Ni-Ti composite coatings.
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1 September 2017
CORROSION SCIENCE SECTION|
April 26 2017
The Roles of Ti Particles in Improving the Corrosion Resistance of Electrochemically Assembled Ni-Ti Composite Coatings
Yuantao Zhao;
Yuantao Zhao
*School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
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Lianbo Wang;
Lianbo Wang
*School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
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Zhenbo Qin;
Zhenbo Qin
**State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China.
***Collaborative Innovation Center for Advanced Ship and deep-Sea Exploration, Shanghai 200240, China.
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Chengxi Wang;
Chengxi Wang
*School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
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Zhou Xu;
Zhou Xu
*School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
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Chuanhai Jiang;
Chuanhai Jiang
‡
*School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
‡Corresponding author. E-mail: [email protected].
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Vincent Ji
Vincent Ji
****ICMMO/LEMHE, UMR 8182, Université Paris-Sud 11, Orsay Cedex 91405, France.
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CORROSION (2017) 73 (9): 1107–1118.
Article history
Received:
February 01 2017
Revision Received:
April 26 2017
Accepted:
April 26 2017
Citation
Yuantao Zhao, Lianbo Wang, Zhenbo Qin, Chengxi Wang, Zhou Xu, Chuanhai Jiang, Vincent Ji; The Roles of Ti Particles in Improving the Corrosion Resistance of Electrochemically Assembled Ni-Ti Composite Coatings. CORROSION 1 September 2017; 73 (9): 1107–1118. doi: https://doi.org/10.5006/2408
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