Corrosion behavior of as-cast ZK60 alloy modified with rare earth addition in sodium sulfate medium

Author(s)

Biancardi, Oliveira Verona ^[1] ; Rosa, Viera Luccas ^[1] ; de Abreu, Lima Bruno ^[1] ; Renato Tavares, Avila Pedro ^[2] ; Correa, Rego Galtiere ^[2] ; Cavalcanti, Pinto Haroldo ^[2] ; Napoleao, Bastos Ivan ^[1] ; Pereira, da Silva Erenilton ^[3]

Affiliation

^[1] Rio Janeiro State Univ, Polytech Inst, Dept Mat, BR-28625570 Nova Friburgo, RJ - Brazil

^[2] Univ Sao Paulo, Engn Sch Sao Carlos, BR-13563120 Sao Carlos, SP - Brazil

^[3] Fed Univ Vales Jequitinhonha & Mucuri UFVJM, Inst Engn Sci & Technol IECT, BR-39447790 Januba, MG - Brazil

• Document type: Journal article
• Source: Corrosion Science; v. 158, SEP 2019.
• Web of Science Citations: 1

Abstract

The corrosion resistance of the as-cast ZK60 alloy with and without 1.5 %wt rare earth (RE) addition and submitted to a dip sol-gel coating was investigated using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) in 0.1 mol/L Na2SO4 solution. Analysis using scanning Kelvin probe force microscopy (SKPFM) was carried out to investigate the corrosion attack mechanism on these alloys. The RE addition has accelerated the ZK60 alloy dissolution by formation of a less noble RE-rich second phase. The dip solgel coating was not confirmed as a powerful tool to enhance the protection against corrosion in the as-cast ZK60 alloys. (AU)

• FAPESP's process: 11/09324-8 - Friction stir welding of thixocast high performance magnesium alloys
• Grantee: Erenilton Pereira da Silva
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 10/11391-2 - Friction stir welding of thixocast high performance magnesium alloys
• Grantee: Haroldo Cavalcanti Pinto
• Support Opportunities: Research Grants - Young Investigators Grants