EFFECT OF HYBRID SURFACE NANOCRYSTALLI-ZATION ON THE ELECTROCHEMICAL CORROSION BEHAVIOR IN 2A14 ALUMINUM ALLOY

doi:10.11900/0412.1961.2016.00102

Acta Metall Sin

2016, Vol. 52

Issue (11): 1413-1422 DOI: 10.11900/0412.1961.2016.00102

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EFFECT OF HYBRID SURFACE NANOCRYSTALLI-ZATION ON THE ELECTROCHEMICAL CORROSION BEHAVIOR IN 2A14 ALUMINUM ALLOY

Jianhai YANG¹,Yuxiang ZHANG¹,Liling GE²(

),Jiazhao CHEN¹,Xin ZHANG¹

1 Rocket Force University of Engineering, Xi'an 710025, China
2 School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China;

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Jianhai YANG,Yuxiang ZHANG,Liling GE,Jiazhao CHEN,Xin ZHANG. EFFECT OF HYBRID SURFACE NANOCRYSTALLI-ZATION ON THE ELECTROCHEMICAL CORROSION BEHAVIOR IN 2A14 ALUMINUM ALLOY. Acta Metall Sin, 2016, 52(11): 1413-1422.

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Abstract

In recent years, the surface nanocrystallization (SNC) technology has received extensive attentions in the field of metal material. The shot peening and surface mechanical rolling processing technology can form the gradient nanostructured (GNS) layer on the surface of metal. The material surface roughness is large generally. Therefore, the problem how to form the thick, smooth, flawless GNS layer is need to solve urgently. By means of the hybrid surface nanocrystallization (HSNC) method of both supersonic fine particles bombarding (SFPB) and surface mechanical rolling treatment (SMRT), a gradient nanostructured surface layer was formed on 2A14 aluminum alloy plate. The electrochemical corrosion behavior of the HSNC sample at the air of room temperature and low temperature liquid nitrogen was compared with that of the original sample in aqueous solution of 3.5%NaCl. The results showed that grain size increases from about 30 nm at the surface layer gradually to coarse grain size of the matrix when the sample was processed by HSNC. The total thickness of the plastic deformation layer is about 130 μm. The surface roughness R_a is about 0.6 μm with the surface microcrack disappeared. Compared to the original sample, the pitting corrosion resistance of the SFPB samples was not improved and the pitting corrosion resistance of the HSNC samples was improved. The self-corrosion potential and pitting corrosion potential increase respectively from -1.01228 and -0.29666 V in the original sample to -0.67445 and 0.026760 V at the air room temperature of the HSNC sample. The pitting corrosion resistance of the HSNC sample at the air of room temperature was the biggest. The analysis showed that the surface GNS grain, significant increase of the nanocrystal boundaries, the introduction of compressive residual stress and the decrease of surface roughness were beneficial to improve the pitting corrosion resistance.

Key words: aluminum alloy, hybrid surface nanocrystallization, gradient nanostructure, pitting corrosion resistance

Received: 23 March 2016

Fund: Supported by National Natural Science Foundation of China (No.51275517) and Special Project of Xi'an University of Technology (No.2014TS002)

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	Jianhai YANG
	Yuxiang ZHANG
	Liling GE
	Jiazhao CHEN
	Xin ZHANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2016.00102 OR https://www.ams.org.cn/EN/Y2016/V52/I11/1413

Fig.1 Schematic of surface mechanical rolling treatment (SMRT) equipment^[13]

Fig.3 Cross-sectional OM image of the 2A14 aluminum alloy

Fig.4 Cross-sectional SEM images of 2A14 aluminum alloy after SNC

(a) SFPB (b) SFPB+SMRT, 20 ℃

Fig.5 Variation of the microhardness with the depth of 2A14 aluminum alloy before and after SNC

Fig.6 Cross-sectional bright field (a, c, e, g) and dark field (b, d, f, h) TEM images of 2A14 aluminum alloy about 100 μm (a~d) and 50 μm (e~h) from surface after SFPB

Fig.7 Cross-sectional bright field (a, c, e) and dark field (b, d, f) TEM images of 2A14 aluminum alloy in the top surface layer after SNC (Insets in Figs.7a, c and e show SAED patters)

(a, b) SFPB (c, d) SFPB+SMRT, 20 ℃ (e, f) SFPB+SMRT, -196 ℃

Fig.8 Potentiodynamic polarization curves of 2A14 aluminum alloy before and after SNC in 3.5%NaCl aqueous solution

Table 2 Electrochemical parameters of 2A14 aluminum alloy before and after SNC in 3.5%NaCl aqueous solution

Fig.9 Low (a, c, e, g) and high (b, d, f, h) magnified SEM images of pitting morphologies of 2A14 aluminum alloy before (a, b) and after (c~h) SNC in 3.5%NaCl aqueous solution

(a, b) original (c, d) SFPB (e, f) SFPB+SMRT, 20 ℃ (g, h) SFPB+SMRT, -196 ℃

Fig.10 EDS analyses of area 1 of the original sample in Fig.9b (a), area 2 of the sample after SFPB in Fig.9d (b), area 3 of the sample after SFPB+SMRT, 20 ℃ in Fig.9f (c) and area 4 of the sample after SFPB+SMRT, -196 ℃ in Fig.9h (d)

Table 3 Element contents in EDS analyses of Fig.10

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