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http://dx.doi.org/10.5695/JKISE.2016.49.3.231

Acid Pickling/polishing of AZ31 Magnesium Alloy  

Fazal, Basit Raza (Surface Technology Division, Korea Institute of Materials Science)
Moon, Sungmo (Surface Technology Division, Korea Institute of Materials Science)
Publication Information
Journal of the Korean institute of surface engineering / v.49, no.3, 2016 , pp. 231-237 More about this Journal
Abstract
This article reports a new chemical bath for preparing a mirror-like surface of AZ31 Mg alloy. In order to find an appropriate chemical polishing solution, four different acidic solutions of sulphuric acid, nitric acid, acetic acid and a specially designed mixture of nitric acid and acetic acid were investigated in view of the changes in surface appearance, roughness and dissolution rate of AZ31 Mg alloy. The surface scales on AZ31 Mg alloy were readily removed by all the acidic solutions, but a reflective surface was produced only by etching in the specially designed solution, and only after a specific etching time. The surface roughness increased with etching time in sulphuric acid, nitric acid, and acetic acid, but it lowered after a specific etching time in the specially designed mixture of nitric acid and acetic acid. Dissolution rate of the alloy in the specially designed mixture of nitric acid and acetic acid appeared to be more than twice than that in separate nitric acid or acetic acid. In this work, we recommend the mirror-like surface of AZ31 Mg alloy obtained by polishing for an optimum time in a mixture of nitric acid and acetic acid for following surface finishings, chemical conversion coating, electroplating, electrophoretic painting and anodizing treatment.
Keywords
Chemical polishing; Surface Finishing; Acid etching; A31 Mg alloy; Surface roughness;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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