Performance of Mg-Sn surface alloys for the sacrificial cathodic protection of Mg alloy AZ31B-H24

•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. Three solid solution Mg-xSn (x = 1, 5, 10 wt%) alloys are evaluated as candidates for the sacrifici...

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Bibliographic Details
Published in:Corrosion science 2019-04, Vol.149, p.195-206
Main Authors: Glover, C.F., Cain, T.W., Scully, J.R.
Format: Article
Language:English
Subjects:
Alloys
AZ31B-H24
Cathodic protection
Corrosion prevention
Corrosion rate
Magnesium
Magnesium base alloys
Maintenance management
Polarity
Solid solutions
Surface alloying
SVET
Tin base alloys
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Summary:•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. 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.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2019.01.015