Growth Process of Scanning Microarc Oxidation Coatings on A356 Alloy and their Corrosion Resistance

doi:10.11901/1005.3093.2016.395

Chinese Journal of Materials Research

2016, Vol. 30

Issue (12): 914-920 DOI: 10.11901/1005.3093.2016.395

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Growth Process of Scanning Microarc Oxidation Coatings on A356 Alloy and their Corrosion Resistance

Lingqin XIA,Jianmin HAN(

),Sha YANG,Zhiyong YANG,Weijing LI

School of Mechanical Electric and Control Engineering, Beijing Jiaotong University, Beijing 100044, China

Cite this article:

Lingqin XIA,Jianmin HAN,Sha YANG,Zhiyong YANG,Weijing LI. Growth Process of Scanning Microarc Oxidation Coatings on A356 Alloy and their Corrosion Resistance. Chinese Journal of Materials Research, 2016, 30(12): 914-920.

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Abstract

Al-alloy A356 was treated by scanning micro arc oxidation (SMAO) method. The voltage-time and coating thickness-time curves were recorded. The microstructure, composition,phase constituent and microhardness profile of coatings werecharacterized. The corrosion behavior of the composite was evaluated by polarization test. Results show that the coating deposited in silicate electrolyte consists of α-Al₂O₃, γ-Al₂O₃ and mullite. The coating and the substrate presented excellent metallurgical bonding. Compared with the common micro arc oxidation (CMAO) coatings on A356 alloy, the SMAO coating contained higher amount of α-Al₂O₃ phase withless porous, and possessed higher micro hardness. However, after treatment by either CMAO or SMAO, the corrosion resistance of A356 alloy was significantly improved.

Key words: materials failure and protection Al-alloy scanning micro arc oxidation ceramic coating corrosion resistance

Received: 02 July 2016

Fund: *Supported by National Natural Science Foundation of China No. 51371022, the Central College Basic Scientific Research Business Expenses Special Funds No. 2015JBM076, China Railway Corporation Science and Technology Research and Development Program No. 2015J008-C.

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	Lingqin XIA
	Jianmin HAN
	Sha YANG
	Zhiyong YANG
	Weijing LI

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.395 OR https://www.cjmr.org/EN/Y2016/V30/I12/914

Fig.1 Schematic of the equipment for scanning micro-arc oxidation treatment

Table 1 Chemical composition of the A356 alloy (%, mass fraction)

Fig.2 (a) Voltage-time response curves for SMAO and CMAO for A356 alloy; (b) Details of the ?rst 20 s of the responses of (a)

Fig.3 Curves showing total, outward and inward growth behavior of SMAO coating as a function of time on A356 substrate at interelectric gap 5 mm

Table 2 Chemical compositions of CMAO and SMAO coating (%, atomic fraction)

Fig.4 Surface morphologies of the A356 alloy treated by CMAO (a) and SMAO (c) respectively (interelectrode gap 5 mm, 0.1 mm/s scanning velocity); (b, d) high magnification of Fig.4a, c

Fig.5 XRD patterns of the coating deposited coatings on A356 alloy substrate for (a) SMAO and (b) CMAO; (c) A356 alloy substrate

Fig.6 Vickers hardness profiles of SMAO and MAO deposits

Fig.7 SEM micrographs showing cross-sections of (a) CMAO, and (b) SMAO oxide deposits

Fig.8 Potentiodynamic polarization curves obtained in 3.5% NaCl solution for A356 alloy before and after MAO treatment

Table 3 Corrosion current densities of A356 substrate and coatings after MAO treatment

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