Effect of laser shock times on electrochemical performance of AZ31 magnesium alloy

LI Xingcheng; ZHANG Yongkang

doi:10.7510/jgjs.issn.1001-3806.2015.04.008

Volume 39 Issue 4

May 2015

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Effect of laser shock times on electrochemical performance of AZ31 magnesium alloy

LI Xingcheng^1,2,
ZHANG Yongkang^3, ,

1.
School of Mechanical Engineering, Jiangsu University of Technology, Changzhou 213001, China;
2.
School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China;
3.
School of Mechanical Engineering, Southeast University, Nanjing 211189, China

Corresponding author: ZHANG Yongkang, ykzhang@ujs.edu.cn
Received Date: 2014-07-14
Accepted Date: 2014-11-17

Abstract

In order to study effect of laser shock times on corrosion resistance of AZ31 magnesium alloy, AZ31 magnesium alloy was processed at different laser shock process (LSP)times by Nd:glass laser with pulse width of 23ns. Microstructures were observed by transmission electron microscopy. Polarization curves and electrochemical impedance spectroscopy were obtained in NaCl solution with 0.035 mass fraction by means of electrochemical measurement technique. The results show that plastic deformation with ultrahigh strain rate happens because of laser shock wave at the surface layer of AZ31 magnesium alloy. High density dislocations with intersect and entanglement of twin crystal exist in the crystal grains and the dislocations led to grain refinement. Polarization curves and electrochemical impedance spectroscopy shows that corrosion potential of AZ31 increases up to 267mV after the first laser shock. Corrosion current increases slightly, reaction resistance increases and corrosion resistance is improved significantly. With the increase of impact times from LSP, corrosion resistance of alloy is not improved significantly. The corresponding impedance spectroscopy has the same conclusion with polarization curves. The study is helpful for improving the corrosion resistance of magnesium alloy during laser shocking processing.
- laser technique,
- laser shocking,
- magnesium alloy,
- microstructure,
- polarization curve,
- electrochemical impedance

References

[1]	LIU Q, SHAN Zh D. Application and prospect of magnesium alloy in automotive industry [J]. Found Technology, 2007, 28(12): 1668-1671 (in Chinese).
[2]	CHEN J F, YE X, SHEN L D, et al. Influence of laser shock processing on friction and wear properties of magnesium alloy [J]. Laser Technology, 2011, 35(5):582-586 (in Chinese).
[3]	CHEN J. Application analysis of magnesium automotive industry [J]. Materials Research and Application, 2010, 4(2): 81-84 (in Chinese).
[4]	ZHANG Y K, CHEN J F,XU R J. Experimental research of laser shock strengthening AM50 magnesium alloy [J]. Chinese Journal Lasers, 2008, 35(7): 1068-1072 (in Chinese).
[5]	SHEN L D, CHEN J F, LI X Ch, et al. Finite element analysis on residual stress field for laser shock processing AM50 magnesium alloy[J]. Laser Technology, 2012, 36(1): 45-49 (in Chinese).
[6]	ZHOU J Zh, WANG Ch D, HUANG Sh, et al. Study on fatigue crack growth performance of 6061-T6 aluminum alloy after laser shot peening [J]. Chinese Journal Lasers, 2011, 38(7): 0703009(in Chinese).
[7]	WANG Y, FAN S X, GAN F, et al. Investigation into micro-extrustion forming based on laser shock in 3003 aluminum alloy[J]. Laser Technology, 2013, 37(6): 820-824 (in Chinese).
[8]	GE M Zh, ZHANG Y K, XIANG J Y. Research on laser shock strengthening and stress corrosion cracking resistance of AZ31B magnesium alloy[J]. Chinese Journal Lasers, 2010, 37(11): 2925-2930 (in Chinese).
[9]	ZHONG J W, LU J Zh, LUO K Y, et al. Tribological behaviors of laser shock processing ANSI 8620 steel [J]. Chinese Journal Lasers, 2012, 39(1): 103001 (in Chinese).
[10]	YU T Y, DAI F Z, ZHANG Y K, et al. Simulation and experiment study on residual stress field of 2024 aluminum alloy induced by flat-top laser beam[J]. Chinese Journal Lasers, 2012, 39(10): 103006 (in Chinese).
[11]	LU J Z, LUO K Y, ZHANG Y K, et al. Grain refinement mechanism of multiple laser shock processing impacts on ANSI 304 stainless steel [J]. Acta Materialia, 2010, 58(16): 5354-5362.
[12]	SUN H Q, SHI Y N, ZHANG M X, et al. Plastic strain-induced grain refinement in the nanometer scale in a Mg alloy [J]. Acta Materialia, 2007, 55(3): 975-982.
[13]	WANG R M, ELIEZER A, GUTMAN E. Microstructures and dislocations in the stressed AZ91D magnesium alloys [J]. Materials Science and Engineering, 2002, A344(1):279-287.
[14]	ZHANG M K, SUN G F, ZHANG W, et al. Study on corrosion property of laser surface alloyed Cr-CrB2 layers on stainless steel[J]. Laser Technology, 2014, 38(2):240-245 (in Chinese).
[15]	ZHANG Y K, YOU J, LU J Zh, et al. Effects of laser shock processing on stress corrosion cracking susceptibility of AZ31B magnesium alloy [J]. Surface Coatings Technology, 2010, 204(24):3947-3953.
[16]	LI Sh Zh, ZHANG L F, XING Q P. Effect of laser shock processing on electrochemical corrosion behavior of AZ91 magnesium alloy[J]. Chinese Journal Lasers, 2013,40(5): 0503004 (in Chinese).
[17]	CHEN J F, LI X Ch, ZHOU J Y, et al. Research on corrosion resistance and mechanism of strengthened layer on AM50 alloy surface processed by laser shot peening [J]. Chinese Journal Lasers, 2011, 38(12): 1203001 (in Chinese).
[18]	LIU B Sh. Microstructure and grain refinement mechanism of surface nanostructure magnesium alloys [D]. Taiyuan: Taiyuan University of Technology, 2007:37-39 (in Chinese).

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

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Effect of laser shock times on electrochemical performance of AZ31 magnesium alloy

Corresponding author: ZHANG Yongkang, ykzhang@ujs.edu.cn

1. School of Mechanical Engineering, Jiangsu University of Technology, Changzhou 213001, China;

2. School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China;

3. School of Mechanical Engineering, Southeast University, Nanjing 211189, China

Received Date: 2014-07-14

Accepted Date: 2014-11-17

Available Online: 2015-07-25

Abstract: In order to study effect of laser shock times on corrosion resistance of AZ31 magnesium alloy, AZ31 magnesium alloy was processed at different laser shock process (LSP)times by Nd:glass laser with pulse width of 23ns. Microstructures were observed by transmission electron microscopy. Polarization curves and electrochemical impedance spectroscopy were obtained in NaCl solution with 0.035 mass fraction by means of electrochemical measurement technique. The results show that plastic deformation with ultrahigh strain rate happens because of laser shock wave at the surface layer of AZ31 magnesium alloy. High density dislocations with intersect and entanglement of twin crystal exist in the crystal grains and the dislocations led to grain refinement. Polarization curves and electrochemical impedance spectroscopy shows that corrosion potential of AZ31 increases up to 267mV after the first laser shock. Corrosion current increases slightly, reaction resistance increases and corrosion resistance is improved significantly. With the increase of impact times from LSP, corrosion resistance of alloy is not improved significantly. The corresponding impedance spectroscopy has the same conclusion with polarization curves. The study is helpful for improving the corrosion resistance of magnesium alloy during laser shocking processing.

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Reference (18)

[1]	LIU Q, SHAN Zh D. Application and prospect of magnesium alloy in automotive industry [J]. Found Technology, 2007, 28(12): 1668-1671 (in Chinese).
[2]	CHEN J F, YE X, SHEN L D, et al. Influence of laser shock processing on friction and wear properties of magnesium alloy [J]. Laser Technology, 2011, 35(5):582-586 (in Chinese).
[3]	CHEN J. Application analysis of magnesium automotive industry [J]. Materials Research and Application, 2010, 4(2): 81-84 (in Chinese).
[4]	ZHANG Y K, CHEN J F,XU R J. Experimental research of laser shock strengthening AM50 magnesium alloy [J]. Chinese Journal Lasers, 2008, 35(7): 1068-1072 (in Chinese).
[5]	SHEN L D, CHEN J F, LI X Ch, et al. Finite element analysis on residual stress field for laser shock processing AM50 magnesium alloy[J]. Laser Technology, 2012, 36(1): 45-49 (in Chinese).
[6]	ZHOU J Zh, WANG Ch D, HUANG Sh, et al. Study on fatigue crack growth performance of 6061-T6 aluminum alloy after laser shot peening [J]. Chinese Journal Lasers, 2011, 38(7): 0703009(in Chinese).
[7]	WANG Y, FAN S X, GAN F, et al. Investigation into micro-extrustion forming based on laser shock in 3003 aluminum alloy[J]. Laser Technology, 2013, 37(6): 820-824 (in Chinese).
[8]	GE M Zh, ZHANG Y K, XIANG J Y. Research on laser shock strengthening and stress corrosion cracking resistance of AZ31B magnesium alloy[J]. Chinese Journal Lasers, 2010, 37(11): 2925-2930 (in Chinese).
[9]	ZHONG J W, LU J Zh, LUO K Y, et al. Tribological behaviors of laser shock processing ANSI 8620 steel [J]. Chinese Journal Lasers, 2012, 39(1): 103001 (in Chinese).
[10]	YU T Y, DAI F Z, ZHANG Y K, et al. Simulation and experiment study on residual stress field of 2024 aluminum alloy induced by flat-top laser beam[J]. Chinese Journal Lasers, 2012, 39(10): 103006 (in Chinese).
[11]	LU J Z, LUO K Y, ZHANG Y K, et al. Grain refinement mechanism of multiple laser shock processing impacts on ANSI 304 stainless steel [J]. Acta Materialia, 2010, 58(16): 5354-5362.
[12]	SUN H Q, SHI Y N, ZHANG M X, et al. Plastic strain-induced grain refinement in the nanometer scale in a Mg alloy [J]. Acta Materialia, 2007, 55(3): 975-982.
[13]	WANG R M, ELIEZER A, GUTMAN E. Microstructures and dislocations in the stressed AZ91D magnesium alloys [J]. Materials Science and Engineering, 2002, A344(1):279-287.
[14]	ZHANG M K, SUN G F, ZHANG W, et al. Study on corrosion property of laser surface alloyed Cr-CrB2 layers on stainless steel[J]. Laser Technology, 2014, 38(2):240-245 (in Chinese).
[15]	ZHANG Y K, YOU J, LU J Zh, et al. Effects of laser shock processing on stress corrosion cracking susceptibility of AZ31B magnesium alloy [J]. Surface Coatings Technology, 2010, 204(24):3947-3953.
[16]	LI Sh Zh, ZHANG L F, XING Q P. Effect of laser shock processing on electrochemical corrosion behavior of AZ91 magnesium alloy[J]. Chinese Journal Lasers, 2013,40(5): 0503004 (in Chinese).
[17]	CHEN J F, LI X Ch, ZHOU J Y, et al. Research on corrosion resistance and mechanism of strengthened layer on AM50 alloy surface processed by laser shot peening [J]. Chinese Journal Lasers, 2011, 38(12): 1203001 (in Chinese).
[18]	LIU B Sh. Microstructure and grain refinement mechanism of surface nanostructure magnesium alloys [D]. Taiyuan: Taiyuan University of Technology, 2007:37-39 (in Chinese).

Effect of laser shock times on electrochemical performance of AZ31 magnesium alloy

Abstract

References

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通讯作者: 陈斌, bchen63@163.com

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