A Review on Anodizing of Aerospace Aluminum Alloys for Corrosion Protection

Coatings

Theodor Hack¹  Malte Burchardt²  Mariana Paz Martínez-Viademonte³  ShoshanT. Abrahami³  Herman Terryn³ 

[1] Airbus Central Research and Technology, Willy-Messerschmitt-Straße 1, 82024 Taufkirchen, Germany;Airbus Operations GmbH Deutschland, GmbH Hünefeldstr. 1-5, 28199 Bremen, Germany;Research Group: Electrochemical and Surface Engineering (SURF), Department of Materials and Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium;

关键词: anodizing;    aluminum alloy;    AA2024;    tartaric-sulfuric acid;    corrosion protection;   

DOI  :  10.3390/coatings10111106

来源: DOAJ

【 摘 要 】

Aluminum alloys used for aerospace applications provide good strength to weight ratio at a reasonable cost but exhibit only limited corrosion resistance. Therefore, a durable and effective corrosion protection system is required to fulfil structural integrity. Typically, an aerospace corrosion protection system consists of a multi-layered scheme employing an anodic oxide with good barrier properties and a porous surface, a corrosion inhibited organic primer, and an organic topcoat. The present review covers published research on the anodic oxide protection layer principles and requirements for aerospace application, the effect of the anodizing process parameters, as well as the importance of process steps taking place before and after anodizing. Moreover, the challenges of chromic acid anodizing (CAA) substitution are discussed and tartaric-sulfuric acid anodizing (TSA) is especially highlighted among the environmentally friendly alternatives.

【 授权许可】

Unknown