Influência do tipo de abrasivo de jateamento no desempenho de esquemas de pintura sobre aço carbono
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Data
2008-08-22
Autores
Caser, Giovani do Carmo
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Universidade Federal do Espírito Santo
Resumo
The object of this study is to analyze the use of steel converter slag, a steel plant byproduct, as an abrasive for blasting and its influence in paint systems performance. Steel coupons were blasted with such abrasive particles and coated with epoxy and alkyd products. For comparison, other samples were blasted using copper slag, a well-known abrasive used by the industry. Besides the abrasive particles own characteristics like morphology, hardness, specific mass, etc., it was analyzed the abrasive effect on the blasted surfaces like topography, surface chemical composition, general appearance and adherence of coatings. Coated coupons were also exposed to accelerated tests in salt spray cabinet, immersion in distilled water and in cathodic disbondment cell, to understand the surface preparation behaviour with such different abrasives. Converter slag blasted against steel samples were able removing a layer of hard and smooth oxide layer, formed in the plate hot mill (mill scale), creating a topography with surface parameters (Ra, Rz, Rt e Rq), similar to the ones normally obtained by use of others abrasives. Characteristics like particle hardness, specific mass, morphology and grain size distribution certainly influenced the results. Converter slag analyzed showed high contents of soluble ions, mainly calcium, which were transferred to the blasted surfaces. The performance of alkyd and epoxy coatings applied over such substrates and tested for adherence, corrosion and blistering formation in salt spray and immersion in distilled water, was clearly inferior to the ones blasted with black copper slag. This trend was not seen in the epoxy coated samples, which showed similar performance between abrasives, indicating a real possibility for use with such coatings.
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Industrial Painting , Slag , Steel , Pintura Industrial , Escória , Aço
Citação
CASER, Giovani do Carmo. Influência do tipo de abrasivo de jateamento no desempenho de esquemas de pintura sobre aço carbono. 2008. Dissertação (Mestrado em Engenharia mecânica) - Universidade Federal do Espírito Santo, Centro Tecnológico, Vitória, 2008.