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Corrosion resistance of laser-fabricated metal-matrix composite layer on stainless steel 316L
Lo, K.H.1; Kwok, C.T.2; Cheng, F.T.1; Man, H.C.3
2001
Conference Name20th International Congress on Applications of Lasers and Electro-Optics (ICALEO 2001)
Source Publication20TH ICALEO 2001, VOLS 92 & 93, CONGRESS PROCEEDINGS
Pages669-678
Conference Date15-18 Oct. 2001
Conference PlaceJacksonville, FL; USA
PublisherLASER INST AMERICA, 12424 RESEARCH PKWY, STE 130, ORLANDO, FL 32826 USA
Abstract

Laser fabrication of ceramic-reinforced metal-matrix composite (MMC)  layer on stainless steel 316Lwas achieved by a two-step process. Ceramic powders (WC, SiC, CrB2) and alloy-ceramic powders (Ni-WC, Co-WC, Ni-Al2O3, Ni-Cr3C2) were preplaced on 316L specimens by pasting or flame spraying and then irradiated by a high power laser to form MMCs with low (up to 28%) and high (over 80%) volume fractions of ceramic particles. The microstructure and composition of the MMC layers were studied by optical microscopy, scanning electron microscopy, energy dispersive X-ray analysis and image analysis. The corrosion behavior of the laser-fabricated layers in 3.5% NaCl solution at 23degreesC was studied by cyclic potentiodynamic polarization technique. The pitting potential of specimens laser-modified with Co-WC and Ni-WC was shifted in the noble direction relative to 316L while there was no improvement in the corrosion resistance in the case of Ni-Al2O3 and Ni-Cr3C2. For specimens modified with ceramic powders, the corrosion resistance  deteriorated. The results of the present study indicated that a high volume fraction of ceramic particles in an MMC layer was unfavorable for corrosion resistance, owing to the difficulty in the formation of intact passive films.

KeywordLaser Surface Modification Stainless Steel 316l Surface Mmc Corrosion
DOIhttps://doi.org/10.2351/1.1536649
Indexed BySCI
Language英语
WOS Research AreaMaterials Science ; Optics ; Physics
WOS SubjectMaterials Science, Multidisciplinary ; Optics ; Physics, Applied
WOS IDWOS:000177444200074
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Document TypeConference paper
CollectionDEPARTMENT OF ELECTROMECHANICAL ENGINEERING
Affiliation1.Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
2.Department of Electromechanical Engineering, Faculty of Science and Technology, University of Macau, Taipei, Macau, China
3.Department of Manufacturing Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
Recommended Citation
GB/T 7714
Lo, K.H.,Kwok, C.T.,Cheng, F.T.,et al. Corrosion resistance of laser-fabricated metal-matrix composite layer on stainless steel 316L[C]:LASER INST AMERICA, 12424 RESEARCH PKWY, STE 130, ORLANDO, FL 32826 USA,2001:669-678.
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