组分调制Ni/Cr多层膜合金化制备Ni-Cr合金覆盖层的耐腐蚀特性

doi:10.11902/1005.4537.2018.053

中国腐蚀与防护学报

2019, Vol. 39

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

研究报告

本期目录 | 过刊浏览

组分调制Ni/Cr多层膜合金化制备Ni-Cr合金覆盖层的耐腐蚀特性

冯旭,费敬银(

),李倍,张嫚,郭琪琪

西北工业大学理学院西安 710129

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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摘要:

利用双槽电沉积法制备组分调制Ni/Cr多层膜，探讨了Ni/Cr多层膜的合金化特性。借助SEM和EDS对Ni-Cr合金覆盖层的表面形貌、微观结构以及化学组成进行了表征。结果表明，减小周期厚度，提高热处理温度，延长保温时间有助于提高多层膜的合金化程度。经高温处理后，Ni-Cr合金覆盖层化学组分均一，与理论值基本吻合；其微观形貌由原来的结节状或颗粒状结构转变为块状结构，并且未产生热应力开裂等现象。与相同厚度的镍镀层和铬镀层比较，Ni-Cr合金覆盖层具有更好的耐腐蚀性能。

关键词 ：三价铬, Ni-Cr合金, 合金化, 耐腐蚀性

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

收稿日期: 2018-04-20

ZTFLH:

TQ153

通讯作者: 费敬银 E-mail: jyfei@nwpu.edu.cn

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

作者简介: 冯旭，男，1993年生，硕士生

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引用本文:

冯旭,费敬银,李倍,张嫚,郭琪琪. 组分调制Ni/Cr多层膜合金化制备Ni-Cr合金覆盖层的耐腐蚀特性[J]. 中国腐蚀与防护学报, 2019, 39(2): 167-175.
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.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2018.053 或 https://www.jcscp.org/CN/Y2019/V39/I2/167

表1 镍镀液和铬镀液的组分和工艺参数

图1 组分调制Ni/Cr多层膜不同周期厚度试样的表面形貌

图2 组分调制Ni/Cr多层膜不同周期厚度试样的表面微观形貌

图3 组分调制Ni/Cr多层膜不同周期厚度试样的断面微观形貌

表2 合金化参数因子及水平

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

表3 正交试验结果

图4 周期厚度对多层膜合金化程度的影响

图5 热处理温度对多层膜合金化程度的影响

图6 保温时间对多层膜合金化程度的影响

图7 经高温合金化后的Ni-Cr合金覆盖层微观表面形貌

图8 Ni-Cr合金覆盖层试样热处理后的微观断面形貌

图9 不同镀层的极化曲线

图10 镀层经过全浸腐蚀实验后的微观形貌

表4 不铜镀层的全浸实验结果

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