6533b833fe1ef96bd129bffd

RESEARCH PRODUCT

Cut-edge corrosion of a Zn–55Al-coated steel: A comparison between sulphate and chloride solutions

B. VuilleminRoland OltraA.q. VuC. Allely

subject

Materials scienceGeneral Chemical EngineeringInorganic chemistryHalideGeneral Chemistryengineering.materialChlorideCorrosionCathodic protectionchemistry.chemical_compoundCoatingchemistrymedicineengineeringGeneral Materials ScienceSolubilitySulfateDissolutionmedicine.drug

description

Abstract Ex situ observations and in situ measurements of current and pH distributions over cut-edge coated steels revealed that Zn–55Al coatings are sacrificial only in chloride solutions, because of an activation of both Zn- and Al-rich phases present in the coating. In sulphate solutions, an efficient cathodic protection occurs only for short times of immersion, because only Zn-rich phases are active in this medium. The low solubility and strong acidification induced by Al(OH)SO4 allows only short distance cathodic protection, but cannot prevent red rust precipitation on the steel surface.

yearjournalcountryeditionlanguage
2011-09-01Corrosion Science
https://doi.org/10.1016/j.corsci.2011.05.048