22-10-2015 дата публикации
Номер: US20150298430A1
Принадлежит:
A vacuum deposition process suitable for coating discrete articles with a zinc-rich, fully alloyed layer is described. In a process step of contacting the article with metallic Zn vapor, the temperature of the article is equal to or higher than the dew point of the Zn vapor. The process results in a coating having a uniform thickness, even on less accessible surfaces. Additionally, the roughness of the steel substrate is essentially preserved. By properly engineering the surface of the substrate, coated articles can be obtained having a roughness providing for optimal paint adhesion. 1. A galvannealed article comprising a steel substrate and a coating layer consisting of Zn—Fe intermetallics , the surface roughness of the substrate being defined by the parameters Ra and Rz , and the surface roughness of the coating layer being defined by the parameters Ra′ and Rz′ , whereby 0.5≦Ra≦20 μm , 5≦Rz≦140 μm , 0.8≦Ra′/Ra≦1.3 , 0.8≦Rz′/Rz≦1.3.2. The galvannealed article according to claim 1 , additionally comprising a layer of paint.3. The galvannealed article according to claim 1 , wherein the coating layer has a mean thickness of more than 10 μm.4. The galvannealed article according to claim 2 , wherein the coating layer has a mean thickness of more than 10 μm. This application is a continuation-in-part of U.S. application Ser. No. 14/519,262, filed Oct. 21, 2014, which is a continuation of U.S. application Ser. No. 13/147,674, filed Nov. 2, 2011, which issued as U.S. Pat. No. 8,895,106 on Nov. 25, 2014, and which is a national stage application of International Application No. PCT/EP2010/000684, filed Feb. 4, 2010, which is a continuation-in-part of International Application No. PCT/EP2009/000750, filed Feb. 4, 2009, the entire contents of these applications are hereby incorporated herein by reference.The present disclosure concerns a process suitable for coating articles, and in particular discrete articles, with a zinc-rich, completely alloyed layer.By discrete articles ...
Подробнее