Effect of Anodization on the Stress Corrosion Cracking Behavior of The AZ61 Magnesium Alloy in 0.1 M NaCl Solution

In the present work, the AZ61 alloy, one of the most important commercial structural magnesium alloys, was anodized in three different alkaline electrolytes consisting of 3 M KOH + 0.15 M Na2 SiO3 + 0.1 M Na2 B4 O7 .10H2 O, 3 M KOH + 0.5 M Na3 PO4 and 3 M KOH + 0.50 M Na2 SiO3 . The treatment was co...

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Published in:Materials research (São Carlos, São Paulo, Brazil) São Paulo, Brazil), 2023-01, Vol.26, p.1
Main Authors: Okamoto, Fábio, Oliveira, Mara Cristina Lopes de, Silva, Adenilson Almeida, Droppa Jr, Roosevelt, Antunes, Renato Altobelli
Format: Article
Language:English
Subjects:
Alloys
anodization
Anodizing
AZ61
Corrosion effects
Corrosion resistance
Corrosion resistant alloys
Current density
Electrolytes
ENGINEERING, CHEMICAL
magnesium alloy
Magnesium base alloys
MATERIALS SCIENCE, MULTIDISCIPLINARY
METALLURGY & METALLURGICAL ENGINEERING
Morphology
Photoelectrons
Room temperature
Slow strain rate
Sodium chloride
Stress corrosion cracking
Tensile tests
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Summary:In the present work, the AZ61 alloy, one of the most important commercial structural magnesium alloys, was anodized in three different alkaline electrolytes consisting of 3 M KOH + 0.15 M Na2 SiO3 + 0.1 M Na2 B4 O7 .10H2 O, 3 M KOH + 0.5 M Na3 PO4 and 3 M KOH + 0.50 M Na2 SiO3 . The treatment was conducted at two different current densities, 20 and 30 mA.cm-2 for 10 minutes. The anodized layers were characterized by scanning electron microscopy, X-ray diffractometry and X-ray photoelectron spectroscopy. The corrosion resistance was assessed by potentiodynamic polarization tests. The SCC behavior was studied using slow strain rate tests in 0.1 M NaCl solution at room temperature. Conventional tensile tests were also conducted in air. The susceptibility to SCC was dependent on the morphology of the anodized film. The composition of the electrolyte and the current density of the anodization treatment affected the SCC susceptibility of the AZ61 alloy. The best corrosion resistance and the lowest susceptibility to SCC were obtained for samples anodized in the borate-containing electrolyte at 30 mA.cm-2. The smooth and compact surface morphology of the anodized film obtained in this condition was the main reason for the improved SCC behavior of the AZ61 alloy.
ISSN:1516-1439
1980-5373
1980-5373
DOI:10.1590/1980-5373-mr-2022-0357