Post-treatment Processes for Corrosion Resistance on Electroless Ni-P Coating

doi:10.11902/1005.4537.2013.106

Journal of Chinese Society for Corrosion and protection

2014, Vol. 34

Issue (3): 265-270 DOI: 10.11902/1005.4537.2013.106

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Post-treatment Processes for Corrosion Resistance on Electroless Ni-P Coating

LIU Guangming(

), LIU Bin

School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China

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Abstract

在钢铁基体上制备化学镀Ni-P镀层后,分别采用γ-氨丙基三乙氧基硅烷 (3-APTS),硬脂酸和3-APTS/硬脂酸对镀层进行防腐蚀后处理,利用点滴法、贴滤纸法、接触角测量、盐水浸渍实验法和电化学测试研究了镀层耐蚀性的变化,比较了各工艺的后处理效果。结果表明：3种后处理工艺都能提高化学镀Ni-P镀层的抗氧化性和耐蚀性,经3-APTS/硬脂酸复合处理后的镀层耐蚀性要优于3-APTS和硬脂酸的单一处理,镀层外观都没有明显变化。同时对缓蚀机理进行了分析。

Key words: electroless Ni-P coating 3-APTS stearic acid compound treatment corrosion resistance

Received: 01 May 2013

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Cite this article:

LIU Guangming, LIU Bin. Post-treatment Processes for Corrosion Resistance on Electroless Ni-P Coating. Journal of Chinese Society for Corrosion and protection, 2014, 34(3): 265-270.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2013.106 OR https://www.jcscp.org/EN/Y2014/V34/I3/265

Table 1 Discolor time and corrosion resistant grade obtained by HNO₃spot and filter paper test respectively

Fig.1

空白试片和经3-APTS、硬脂酸、3-APTS/硬脂酸处理后试样的接触角

Fig.2

空白试片和经后处理试片在5%NaCl溶液中浸泡72 h后的腐蚀形貌

Fig.3

试片在3.5%NaCl溶液中的极化曲线

Table 2 Results fitted from polarization curves

Fig.4

电化学阻抗谱的等效电路图

Fig.5

试片在3.5%NaCl溶液中的EIS谱

Table 3 Results fitted from EIS plots

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