Title: Improving corrosion resistance in sintered 304L stainless steel using shot blasting

Authors: Pongporn Moonchaleanporn; Sukrit Songkuea; Jamorn Klanpolrang; Phonlasit Payaksak; Kosit Wongpinkaew; Nirut Bunchoo; Ekkarut Viyanit; Anchalee Manonukul

Addresses: National Metal and Materials Technology Center (MTEC), National Science and Technology Development Agency (NSTDA), 114 Thailand Science Park, Paholyothin Road, Klong 1, Klong Luang, Pathumthani 12120, Thailand ' National Metal and Materials Technology Center (MTEC), National Science and Technology Development Agency (NSTDA), 114 Thailand Science Park, Paholyothin Road, Klong 1, Klong Luang, Pathumthani 12120, Thailand ' Standard Units Supply (Thailand) Co. Ltd., 299 M.10, Banthi, Lamphun 51180, Thailand ' Standard Units Supply (Thailand) Co. Ltd., 299 M.10, Banthi, Lamphun 51180, Thailand ' National Metal and Materials Technology Center (MTEC), National Science and Technology Development Agency (NSTDA), 114 Thailand Science Park, Paholyothin Road, Klong 1, Klong Luang, Pathumthani 12120, Thailand ' National Metal and Materials Technology Center (MTEC), National Science and Technology Development Agency (NSTDA), 114 Thailand Science Park, Paholyothin Road, Klong 1, Klong Luang, Pathumthani 12120, Thailand ' National Metal and Materials Technology Center (MTEC), National Science and Technology Development Agency (NSTDA), 114 Thailand Science Park, Paholyothin Road, Klong 1, Klong Luang, Pathumthani 12120, Thailand ' National Metal and Materials Technology Center (MTEC), National Science and Technology Development Agency (NSTDA), 114 Thailand Science Park, Paholyothin Road, Klong 1, Klong Luang, Pathumthani 12120, Thailand

Abstract: Sintering atmosphere conditions can affect the corrosion resistance of sintered 304L stainless steel. In addition, surface modifications can improve surface finish and corrosion resistance. In this study, 304L stainless steel was sintered under nitrogen or argon atmospheres using two different heating rates. Barrelling and zinc shot blasting were applied. Subsequently, all samples were subjected to salt spray testing for determination of their corrosion resistance. Both barrelling and shot blasting decreased the surface porosity and surface roughness. However, barrelling and shot blasting increased surface hardness. For as-sintered samples, sintering in nitrogen atmosphere slightly improved the corrosion resistance. Barrelling slightly increased the corrosion resistance of those sintered in argon atmosphere. Shot blasting significantly improved the corrosion resistance of samples sintered in argon atmosphere. However, shot blasting produced less improvement in the corrosion resistance of those sintered in nitrogen atmosphere.

Keywords: powder metallurgy; shot blasting; barrelling; salt spray.

DOI: 10.1504/IJMPT.2019.102643

International Journal of Materials and Product Technology, 2019 Vol.59 No.2, pp.172 - 191

Accepted: 14 Apr 2019
Published online: 30 Sep 2019 *

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