EFFECT OF La_2O_3 ON CORROSION RESISTANCE OF LASER CLAD Ni-BASED ALLOY COATINGS

J Chin Soc Corr Pro

1998, Vol. 18

Issue (3): 237-240 DOI:

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EFFECT OF La_2O_3 ON CORROSION RESISTANCE OF LASER CLAD Ni-BASED ALLOY COATINGS

WANG Kun-lin ZHANG Qing-bo ZHU Yun-ming WEI Xing-guo(Department of Mechanical Engineering; Tsinghua University; Beijing 100084) (Faculty of Science and Technology; University of Macau; Macau)

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Abstract The effect of La2O3 on microstructure and corrosion resistance of laser clad Ni-based alloy coatings was investigated. The experimental results showed that the addition of La2O3 could modify the microstructure and improve corrosion resistance of these coatings. Their microstructure was refined and purified. In the clad coatings containing La2O3, both secondary dendrite space and inclusion percentage were reduced. The corrosion weight loss of the clad coatings with different amounts of La2O3 was much smaller than that of the coatings without La2O3 in HNO3 solution. The anodic polarization curves also proved that the corrosion resistance of the laser clad coatings in HNO3, H2SO4, HCl and NaCl solutions, was significantly improved with the addition of La2O3.

Key words: La_2O_3 Laser clad coating Corrosion resistance

Received: 25 June 1998

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WANG Kun-lin ZHANG Qing-bo ZHU Yun-ming WEI Xing-guo(Department of Mechanical Engineering; Tsinghua University; Beijing 100084) (Faculty of Science and Technology; University of Macau; Macau). EFFECT OF La_2O_3 ON CORROSION RESISTANCE OF LASER CLAD Ni-BASED ALLOY COATINGS. J Chin Soc Corr Pro, 1998, 18(3): 237-240.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1998/V18/I3/237

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