Performance of Mg-Sn surface alloys for the sacrificial cathodic protection of Mg alloy AZ31B-H24. (1st April 2019)

• Record Type: Journal Article
• Authors: Glover, C.F.; Cain, T.W.; Scully, J.R.
• Is Part Of: Corrosion science. Volume 149(2019)
• Page Start: 195
• Page End: 206
• Publication Date: 2019-04-01
• Subjects: Magnesium -- Cathodic protection -- AZ31B-H24 -- SVET; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2019.01.015
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Mg-1Sn galvanically protects AZ31B-H24 for 24 h with 95% efficiency. Mg-5Sn shows only partial galvanic protection of AZ31B-H24. Mg-1Sn alloy shown to have a higher self-corrosion rate Mg-5Sn alloys. Abstract: Three solid solution Mg-xSn (x = 1, 5, 10 wt%) alloys are evaluated as candidates for the sacrificial cathodic protection of AZ31B-H24. The performance of each alloy was studied in situ with global and local measurements of galvanic couples between Mg-Sn alloys and AZ31B-H24 when immersed in 0.6 M aqueous NaCl solution. Mg-1Sn was shown to galvanically protect AZ31B-H24 for 24 h with 95% efficiency. Polarity reversal was observed for Mg-5Sn during the initial 10 h, after which protection was offered; and Mg-10Sn provided no protection. Self-corrosion rates of 60% and 52% were observed for Mg-1Sn and Mg-5Sn alloys, respectively.