Corrosion Performance of Ni-Cr Alloy Coatings Prepared by Alloying Ni/Cr Multilayered Films of Thickness Modulation

doi:10.11902/1005.4537.2018.053

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (2): 167-175 DOI: 10.11902/1005.4537.2018.053

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Corrosion Performance of Ni-Cr Alloy Coatings Prepared by Alloying Ni/Cr Multilayered Films of Thickness Modulation

Xu FENG,Jingyin FEI(

),Bei LI,Man ZHANG,Qiqi GUO

Faculty of Science，Northwestern Polytechnical University, Xi'an 710129, China

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Abstract

Ni-Cr alloy coatings were prepared via a two-step process, namely Ni/Cr multilayered films of thickness modulation were firstly prepared by dual bath technique, which then subjected to alloying treatment at proper elevated temperature. The microstructure and chemical composition of Ni-Cr alloy coatings were characterized by means of SEM and EDS. The results show that with the decreasing period of modulation as well as the increasing heat-treatment temperature and time, the alloying process for Ni/Cr multilayered films could be expediently realized. After high temperature treatment, the chemical composition of the Ni-Cr alloy coatings is homogeneous on average, which is basically consistent with the theoretical value. Of which the surface morphology changes from the original nodular- or granular-like structure to block-like structure, while no thermal stress cracking is observed. Besides, their corrosion resistance was evaluated in comparison with nickel coating and chromium coating of the same thickness. It is found that the Ni-Cr alloy coatings have better corrosion resistance.

Key words: trivalent chromium Ni-Cr alloy alloying corrosive resistance

Received: 20 April 2018

ZTFLH:

TQ153

Corresponding Authors: Jingyin FEI E-mail: jyfei@nwpu.edu.cn

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Cite this article:

Xu FENG,Jingyin FEI,Bei LI,Man ZHANG,Qiqi GUO. Corrosion Performance of Ni-Cr Alloy Coatings Prepared by Alloying Ni/Cr Multilayered Films of Thickness Modulation. Journal of Chinese Society for Corrosion and protection, 2019, 39(2): 167-175.

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https://www.jcscp.org/EN/10.11902/1005.4537.2018.053 OR https://www.jcscp.org/EN/Y2019/V39/I2/167

Table 1 Compositions of nickle and chromium plating baths and electrodeposition processes

Fig.1 Macro appearances of Ni/Cr CMMF coatings with λ=4 μm (a), λ=2 μm (b) and λ=1 μm (c)

Fig.2 Surface morphologies of Ni/Cr CMMF coatings with λ=4 μm (a), λ=2 μm (b) and λ=1 μm (c)

Fig.3 Cross-sectional morphologies of Ni/Cr CMMF coat-ings with λ=4 μm (a), λ=2 μm (b) and λ=1 μm (c)

Table 2 Influencing factors and levels of alloying of Ni/Cr CMMF coatings

Sample number	Influencing factor and level			Experimental result
Sample number	A: λ / μm	B: t / h	C: T / ℃	Average value μ	Standard deviation $σ$
1	4	2	300	47.87%	27.14
2	4	5	500	40.45%	13.42
3	4	8	800	45.66%	1.92
4	2	2	500	43.95%	19.82
5	2	5	800	45.13%	4.15
6	2	8	300	38.18%	14.25
7	1	2	800	41.86%	11.67
8	1	5	300	39.44%	15.47
9	1	8	500	44.76%	7.72

Fig.4 Effect of period thickness on alloying of Ni/Cr CMMF coatings

Fig.5 Effect of temperature on alloying of Ni/Cr CMMF coatings

Fig.6 Effect of heating time on alloying of Ni/Cr CMMF coatings

Fig.7 Surface morphologies of Ni-Cr CMMF coatings with λ=4 μm (a), λ=2 μm (b) and λ=1 μm (c) after heat treatment at 800 ℃ for 8 h in N₂

Fig.8 Cross-sectional morphology of alloying Ni-Cr CMMF coating with λ=1 μm after heat treatment at 800 ℃ for 8 h in N₂

Fig.9 Polarization curves of Ni, Cr and Ni-Cr alloying coatings

Fig.10 Surface morphologies of nickel (a), chromium (b) and alloying Ni-Cr (c) coatings after immersion test

Table 4 Corrosion rates of Ni, Cr and Ni-Cr alloying coatings during immersion in 3.5%NaCl solutions

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