Doublet Aurélien, Kjellberg Marianne, Jousselme Bruno, Pinault Mathieu, Deniau Guy, Cornut Renaud, Charrier Gaëlle
CEA Saclay Gif-sur-Yvette 91191 France
PROTEC Industrie 208 rue Michel Carré, 95870 Bezons France.
RSC Adv. 2019 Aug 2;9(42):24043-24049. doi: 10.1039/c9ra03657a.
In this work, a multifunctional non-toxic chromium free treatment is proposed. Hexavalent chromium, largely used for anticorrosion surface treatments of aluminum alloys in aeronautics, will soon be completely banned due to its high toxicity (European REACH regulation) and new solutions are required. Here, in a first step, a polymeric film was grafted at the aluminum surface by the surface induced reduction of a diazonium salt. In a second step, the grafted surface was submitted to an anodization treatment, forming a thick aluminum oxide layer protecting the underlying metal against corrosion. No change in the organic coating was detected after the second step of the process. This leads to a multilayer coating, which provides competitive results regarding both the adhesion of paint and corrosion protection.
在这项工作中，提出了一种多功能无毒无铬处理方法。六价铬大量用于航空铝合金的防腐表面处理，由于其高毒性（欧洲化学品注册、评估、授权和限制法规），很快将被完全禁止，因此需要新的解决方案。在此，第一步，通过重氮盐的表面诱导还原在铝表面接枝聚合物膜。第二步，对接枝表面进行阳极氧化处理，形成一层厚的氧化铝层，保护下层金属免受腐蚀。在该工艺的第二步之后，未检测到有机涂层有变化。这导致形成一种多层涂层，该涂层在油漆附着力和腐蚀防护方面都提供了具有竞争力的结果。
