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5115 |
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Tuesday, May 10, 2016, Auditorium 11:10 AM Cold Gas Spraying I |
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Improving corrosion resistance of Zn-Al15 coating deposited by an in-situ shot-peening assisted cold spray |
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Chang-Jiu Li* / Xi'an Jiaotong University, P.R. China Ying-Kang Wei / State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering, Xian Jiaotong University, China Yu-Juan Li/ State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering, Xian Jiaotong University, China Xiao-Tao Luo/ State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering, Xian Jiaotong University, China Chang-Jiu Li/ State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering, Xian Jiaotong University, China |
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In this study, Zn-Al15 coating was deposited on steel substrate by cold spray with a commercially Zn-Al15 powder blended with large sized stainless steel particles (as in-situ shot-peening particles) using nitrogen gases at low working gas pressure and temperature. Powders and coatings were characterized by scanning electron microscopy and microhardness measurements. It was found that through introducing the in-situ tamping effect by using SP particles, the plastic deformation of deposited particles is significantly enhanced, thereby resulting in a dense Zn-Al15 coating. With the strong impact of hard particle on substrate, a mutual crisscross structure formed at the coating/substrate interface, and therefore the bond strength of coating was improved. SEM observations revealed that no SP particle was incorporated into Zn-Al15 coating. The effect of SP particles on the deposition efficiency of Zn-Al15 particles was also examined. The electrochemical corrosion experiments revealed that using in-situ shot-peening assisted cold spraying it is possible to deposit dense Zn-Al15 coating which can provide effective protection for the steel materials from corrosion. |