Protective Performance of a Novel Silicone Coating ES150 Modified with Nano-particulate of Metal for AZ91D Mg-alloy

doi:10.11902/1005.4537.2017.111

Journal of Chinese Society for Corrosion and protection

2018, Vol. 38

Issue (4): 373-380 DOI: 10.11902/1005.4537.2017.111

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Protective Performance of a Novel Silicone Coating ES150 Modified with Nano-particulate of Metal for AZ91D Mg-alloy

Taotao XU¹, Zhuqiao CHEN¹, Weiping TIAN¹, Cheng WANG²(

), Shenglong ZHU², Fuhui WANG³, Tao ZHANG², Minghui CHEN³

1 AVIC Tianjin Aviation Electro-mechanical Co., Ltd., Tianjin 300308, China
2 Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3 School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

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Abstract

A novel protective coating, namely ES150 silicone modified with nano-particulate of metal was prepared by physical blending process, which was further applied on AZ91D Mg-alloy, and then the corrosion resistance of the coated alloy was evaluated by electrochemical impedance spectroscopy (EIS), immersion test in 3.5% (mass fraction) NaCl solution and neutral salt spray exposure. The results indicated that lots of micropores could be observed within the silicone lacquer coating, which deteriorates its protective efficiency. In contrast, the number of micropores decreased greatly for the modified silicone coatings with nano-particulate of metal. The modified ES150 coatings can withstand 6000 h immersion in 3.5%NaCl solution and 5000 h neutral salt spray exposure without blistering, peeling off or corrosion. The impedance of the coatings is larger than 10⁹ Ω·cm² during immersion in 3.5%NaCl solution. The SO₂ accelerated corrosion experiments revealed that the coatings provide sufficient protectiveness for airplane workpieces.

Key words: organosilion protective coating sulfur dioxide corrosion

Received: 06 July 2017

ZTFLH:

TQ630

Fund: Supported by National Natural Science Foundation of China (51531007)

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	Articles by authors
	Taotao XU
	Zhuqiao CHEN
	Weiping TIAN
	Cheng WANG
	Shenglong ZHU
	Fuhui WANG
	Tao ZHANG
	Minghui CHEN

Cite this article:

Taotao XU, Zhuqiao CHEN, Weiping TIAN, Cheng WANG, Shenglong ZHU, Fuhui WANG, Tao ZHANG, Minghui CHEN. Protective Performance of a Novel Silicone Coating ES150 Modified with Nano-particulate of Metal for AZ91D Mg-alloy. Journal of Chinese Society for Corrosion and protection, 2018, 38(4): 373-380.

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https://www.jcscp.org/EN/10.11902/1005.4537.2017.111 OR https://www.jcscp.org/EN/Y2018/V38/I4/373

Fig.1 Suface (a, c) and cross sectional (b, d) SEM images of the as-received varnish silicone coating (a, b) and nano-modified silicone coating (c, d)

Fig.2 Nyquist (a), Bode-module (b) and Bode-phase angle (c) plots of the varnish coating during immersion in 3.5%NaCl solution (the solid lines denote fitting data)

Fig.3 Nyquist (a), Bode-module (b) and Bode-phase angle (c) plots of the nano-modified silicone coating during immersion in 3.5%NaCl solution (the solid linesrepresent fitting data)

Fig.4 Equivalent circuit of EIS

Fig.5 Evolutions of R_c (a), C_c (b) and R_ct (c) of two silicone coatings with immersion time

Fig.6 Macroscopical appearances of the nano modified silicone coating before (a, c) and after (b, d) removal of corrosion products formed during immersion in 3.5%NaCl solution for 6000 h (a, b) and neutral salt spray exposure for 5000 h (c, d)

Fig.7 Surface (a, c, e) and cross sectional (b, d) SEM images of the nano-modified coating/AZ91D magnesium alloy exposed in neutral salt spray for 5000 h (a, b) and immersed in 3.5%NaCl solution for 6000 h (c, d) , and the varnish coating/AZ91D magnesium alloy immersed in 3.5%NaCl solution for 5668 h (e)

Fig.8 Macroscopical appearances of TOPS (a), passivation/WD40 (b), twice electroless nickel plating (c), marble-electroless nickel plating/WD40 (d) and ES150 nano-modified silicone (e, f) coatings after exposure in SO₂ containing environment for 120 h

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