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Delamination Resistant Zinc Alloys: Simple Concept and Results on the System Zinc‐Magnesium
Author(s) -
Hausbrand René,
Stratmann Martin,
Rohwerder Michael
Publication year - 2003
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.200300212
Subject(s) - zinc , magnesium , materials science , delamination (geology) , cathodic protection , metallurgy , intermetallic , corrosion , alloy , electrode , chemistry , electrochemistry , paleontology , biology , subduction , tectonics
Alloying zinc coatings with elements such as magnesium and titanium increases the corrosion resistance in industrial tests. Based on the fundamental mechanism of cathodic delamination, a simple concept how alloying zinc with specific elements might improve its resistance to cathodic delamination is presented in this paper. As an example, results concerning the delamination of a simple polymer from the zinc‐magnesium intermetallic MgZn 2 are presented. From electrode potential measurements obtained with the Scanning Kelvin Probe it can be concluded that cathodic delamination from this alloy is completely inhibited. This behaviour is attributed to the electronic properties of the magnesium‐rich oxidic passive layer, that inhibits the oxygen reduction reaction at the metal oxide/polymer interface.