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Acid Pickling/polishing of AZ31 Magnesium Alloy
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 Title & Authors
Acid Pickling/polishing of AZ31 Magnesium Alloy
Fazal, Basit Raza; Moon, Sungmo;
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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.
Chemical polishing;Surface Finishing;Acid etching;A31 Mg alloy;Surface roughness;
 Cited by
B.F. Gerard, Anisotropy and Voiding at High Strain Rates in a Mg Alloy Extrudate, Advanced Materials and Processes 168 (2010) 16-17.

S. Moon, A Blade-Abrading Method for Surface Pretreatment of Mg Alloys, J. Korean Inst. Surf. Eng. 48 (2015) 194-198. crossref(new window)

Investigating Microstructural Gradients and High Strain Rate Deformation Mechanisms in Industrial Magnesium Alloy Components, ProQuest, 2009.

U.C. Nwaogu, C. Blawert, N. Scharnagl, W. Dietzel, K.U. Kainer, Influence of inorganic acid pickling on the corrosion resistance of magnesium alloy AZ31 sheet, Corros. Sci. 51 (2009) 2544-2556. crossref(new window)

U.C. Nwaogu, C. Blawert, N. Scharnagl, W. Dietzel, K.U. Kainer, Effects of organic acid pickling on the corrosion resistance of magnesium alloy AZ31 sheet, Corros. Sci. 52 (2010) 2143-2154. crossref(new window)

Metals Handbook, Surface Cleaning, Finishing and Coating, vol. 5, ninth ed., ASM International, USA, 1994.

H. Vinke, G. Bierman, P. J. Hamersma, J. M. H. Fortuin, Adhesion of small catalyst particles to gas bubbles: determination of small effective solidliquid- gas contact angles, Chem. Eng. Sci. 46 (1991) 2497-2506. crossref(new window)

J. Skvarla, S. Kmet, What is the role of hydrophilic/hydrophobic surface forces and/or polar interfacial interactions in the interaction between bubbles and minerals?, Colloid. Surf. A, 79 (1993) 89-95. crossref(new window)

T. Baum, D.J. Schiffrin, AFM study of surface finish improvement by ultrasound in the anisotropic etching of Si in KOH for micromachining applications, J. Micromechanics Microengineering. 7 (1997) 338-342. crossref(new window)

T. Baum, J. Satherley, D.J. Schiffrin, Contact angle, gas bubble detachment, and surface roughness in the anisotropic dissolution of Si (100) in aqueous KOH, Langmuir. 14 (1998) 2925-2928. crossref(new window)

T. Hynninen, M.A. Gosalvez, Model for hydrogen bubbles and connection to roughness of etched surfaces, J. Chem. Phys. 129 (2008) 156101-1-1561012. crossref(new window)

Z. Liu, W. Gao, A novel process of electroless Ni-P plating with plasma electrolytic oxidation pretreatment, Appl. Surf. Sci. 253 (2006) 2988-2991. crossref(new window)

Z. Liu, W. Gao, Electroless nickel plating on AZ91 Mg alloy substrate, Surf. Coat. Technol. 200 (2006) 5087-5093. crossref(new window)

J. O'M. Bockris and A. K. N. Reddy, Modern Electrochemistry 2B: Electrodics in Chemistry, Engineering, Biology and Environmental Science, Springer, NY, USA (2001).

L. Rossrucker, A. Samaniego, J.-P. Grote, A.M. Mingers, C.A. Laska, N. Birbilis, G.S. Frankel, K. J. J. Mayrhofer, The pH dependence of magnesium dissolution and hydrogen evolution during anodic polarization, J. Electrochem. Soc. 162 (2015) C333-C339. crossref(new window)

W. Haiss, P. Raisch, L. Bitsch, R.J. Nichols, X. Xia, J.J. Kelly, D.J. Schiffrin, Surface termination and hydrogen bubble adhesion on Si(100) surfaces during anisotropic dissolution in aqueous KOH, J. Electroanal. Chem. 597 (2006) 1-12. crossref(new window)