Cerium conversion coating and sol-gel coating for corrosion protection of the WE43 Mg alloy

Autor(es)

Pereira, Gualter Silva ; Ramirez, Oscar Mauricio Prada ; Avila, Pedro Renato Tavares ; Avila, Julian Arnaldo ; Pinto, Haroldo Cavalcanti ; Miyazaki, Marcos Hideki ; de Melo, Hercilio Gomes ; Bose Filho, Waldek Wladimir

• Tipo de documento: Artigo Científico
• Fonte: Corrosion Science; v. 206, p. 18-pg., 2022-07-28.

Resumo

In this work, the electrochemical behavior and morphological characterization of a system consisting of a cerium conversion layer, a hybrid sol-gel coating, and the two coatings applied sequentially (duplex) have been evaluated for the corrosion protection of WE43 Mg alloy. The different characterization techniques showed that the surface coverage by the hybrid coating was improved by the previous application of the conversion coating. The fitting of the impedance diagrams with electrical equivalent circuits allowed to propose a physical model for the coating, evidencing its interaction with the porous Mg oxide/hydroxide layer. Self-healing properties of the duplex coating were also disclosed. (AU)

• Processo FAPESP: 13/13235-6 - Estudo da corrosão localizada e caracterização da resistência à corrosão associada à fadiga na região de solda em ligas de alumínio de elevada resistência soldadas por fricção (FSW)
• Beneficiário: Isolda Costa
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 18/01096-5 - Estudo da corrosão da liga AA2024-T3 anodizada em TSA e protegida com íons Ce e por revestimento híbrido sol-gel
• Beneficiário: Hercílio Gomes de Melo
• Modalidade de apoio: Auxílio à Pesquisa - Regular