Microstructure and corrosion resistant property of laser surface melting layer of AM50 magnesium alloy

被引：1

作者：

School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China ^{[1
]}

不详 ^{[2
]}

机构：

[1] School of Mechanical Engineering, Jiangsu University

[2] School of Mechanical and Automobile Engineering, Jiangsu Teachers University of Technology

来源：

Zhongguo Jiguang | 2008年 / 2卷 / 307-310期

关键词：

Corrosion resistant property; Laser surface melting; Laser technique; Magnesium alloy; Microstructure and composition;

D O I：

10.3788/CJL20083502.0307

中图分类号：

学科分类号：

摘要：

Surface of AM50 magnesium alloy was melted using continuous wave CO2 laser. The microstructure and composition of the melted layer were analysed by scanning electron microscope (SEM), energy dispersion spectrum (EDS) and X-ray diffraction (XRD). The corrosion behaviour of the laser-treated and untreated samples were studied in 3.5% (mass fraction) NaCl solution by measuring electrochemical polarization curves and immerging. The microstructure of the melted layer was refined highly, the composition and structure were more uniform, the β-phase was decreased, Al and impurity elements in solid solution were increased. The experimental results show that the corrosion potential of the laser melted sample is about 37 mV higher than that of the as-received sample, while the anodic current density is about one order of magnitude lower and the pitting corrosion develop more slowly. The corrosion resistance of the laser surface melting of AM50 is significantly improved.

引用

页码：307 / 310

页数：3

共 11 条

[1]

Gao B., Hao S., Zou J., Effect of high current pulsed electron beam treatment on surface microstructure and wear and corrosion resistance of an AZ91HP magnesium alloy, Surface and Coatings Technology, 201, 14, pp. 6297-6303, (2007)

[2]

Shi Z., Song G., Atrens A., The corrosion performance of anodised magnesium alloys, Corrosion Science, 48, 11, pp. 3531-3546, (2006)

[3]

Yue T.M., Su Y.P., Yang H.O., Laser cladding of Zr65 Al7.6 Ni10Cu17.6 amorphous alloy on magnesium, Materials Letters, 61, 1, pp. 209-212, (2007)

[4]

Ye Y., Fu Y., Yang G., Study on laser phase transformation hardening of HT250 by high speed axis flow CO2 laser, Chinese J. Lasers, A29, 10, pp. 945-949, (2002)

[5]

Liu J., Sun F., Yu H., Nitriding surface of iron by the mixing method with laser and plasma beams, Chinese J. Lasers, 32, 11, pp. 1577-1582, (2005)

[6]

Ignat S., Sallamand P., Grevey D., Magnesium alloys laser (Nd:YAG) cladding and alloying with side injection of aluminium powder, Applied Surface Science, 225, 1, pp. 124-134, (2004)

[7]

Abbas G., Li L., Ghazanfar U., Effect of high power diode laser surface melting on wear resistance of magnesium alloys, Wear, 260, 1, pp. 175-180, (2006)

[8]

Yang S., Huang W., Liu W., Research on laser rapid directional solidification with ultra-high Temperature gradient, Chinese J. Lasers, A29, 5, pp. 475-479, (2002)

[9]

Birbilis N., Howlett P.C., MacFarlane D.R., Exploring corrosion protection of Mg via ionic liquid pretreatment, Surface and Coatings Technology, 201, 8, pp. 4496-4504, (2007)

[10]

Song G., Atrens A., Dargusch M., Influence of microstructure on the corrosion of diecast AZ91D, Gorrosion Science, 41, 2, pp. 249-273, (1999)

← 1 2 →