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2059 |
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Tuesday, May 04, 2010, Sophia Room 11:40 AM Properties 1 |
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Effect of blasting angle and blasting time on the amount of residual grit blasted on steel substrate and adhesive property of sprayed coating |
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Toru Maruyama* / Kansai Univ., Japan Tomoya Miyazaki / Graduate School of Kansai University, Japan Takanori Kishita/ Graduate School of Kansai University, Japan Takeshi Kobayashi/ Kansai University, Japan |
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Blasting angle and blasting time are highly effective parameters for adhesive property of sprayed coating. However, these parameters are also effective for residual grit, and the residual grit on substrate after blasting process can reduce adhesion property of thermal sprayed coating. On the other hand, optimum process of blasting is still unclear due to complex phenomenon of surface roughening. Relationship between blasting angle and blasting time and adhesive property of Zn-Al sprayed coating was investigated, and relationship between adhesive strength and residual grit amount was revealed. Residual grit was extracted by dissolving a steel substrate after blasting, and the amount of residual grit was measured. Blasting time was changed between 0.07s and 60s. Blasting angle was changed between 30-90 degree. Adhesive strength of Zn-Al alloy coating made by wire frame spraying increases with increasing blasting time. The blasted surface property for adhesion can change complexly because two phenomenon occur simultaneously during blasting. One is surface roughening, the other is surface cleaning. The residual girt can also change adhesion of sprayed coating. |