[Kovove materialy - Metallic materials]
    Mon - January 25, 2021 - 14:33 No. of hits : 1227827 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 58 (2020), Issue 3

Al-WC composite coating on AZ91D Mg alloy by low power pulsed laser cladding
ZHANG, Y. Q., LI, Z. Y., LIU, S. Y., WEI, S. Z.
vol. 58 (2020), no. 3, pp. 169 - 179

Laser cladding coatings were fabricated on AZ91D magnesium alloy using Al and WC powders with a weight percentage ratio of 95:5, 90:10, and 85:15 by a low power pulsed Nd:YAG laser. During the process of laser cladding, most of WC was decomposed. Tiny white granular resultant Al18Mg3W2 was detected in all coatings, while bright white Al4W particles with clustering tendency were found only in the 10 and 15 wt.% WC coatings because of relatively high WC content. α-Al, α-Mg, Al3Mg2, and Al12Mg17 were also detected at the coatings. The hardness of the coatings increased by 3–4 times compared with that of the substrate. The corrosion resistance of the coatings was also improved markedly, mainly the passivation phenomenon was observed in all coatings, which may benefit from the formation of oxidation film Al2O3 ⋅ H2O on the surface of the coatings due to high Al concentration.

Key words
laser cladding, magnesium alloy, corrosion, WC, Al

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.

Article abstracts updated: 2021-01-15 08:18      
Articles in press revised: 2020-10-30 12:09     
Full text pdf uploaded: 2020-11-09 13:07    
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