Effect of fluoride on plasma electrolytic oxidation of AZ61 magnesium alloy

被引：45
作者：
Nemcova, A. [1 ]
Skeldon, P. [2 ]
Thompson, G. E. [2 ]
Pacal, B. [1 ]
机构：
[1] Brno Univ Technol, Inst Mat Sci & Engn, Fac Mech Engn, CS-61090 Brno, Czech Republic
[2] Univ Manchester, Ctr Corros & Protect, Sch Mat, Manchester M13 9PL, Lancs, England
来源：
SURFACE & COATINGS TECHNOLOGY | 2013年 / 232卷
基金：
英国工程与自然科学研究理事会;
关键词：
Magnesium alloy; Plasma electrolytic oxidation; Fluoride; Corrosion; CORROSION-RESISTANCE; POTASSIUM FLUORIDE; PEO COATINGS; SILICATE; BEHAVIOR; FILMS; AZ91D; SURFACE; AL; DEFORMATION;
D O I：
10.1016/j.surfcoat.2013.06.107
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Plasma electrolytic oxidation has been carried out on AZ61 magnesium alloy in a silicate-phosphate electrolyte under pulsed current conditions. It is shown that the addition of fluoride to the electrolyte reduced localized corrosion that occurred near Al-Mn intermetallic particles before sparking begins. Such corrosion affected the uniformity of the PEO coating. On the other hand, fluoride ions caused significant loss of coating material during coating growth. Irrespective of the fluoride addition, the coatings contained Mg-3(PO4)(2), amorphous material and possibly MgO. However, fluoride strongly affected the rate of coating growth and the morphology of the coating. The loss of coating material is suggested to be due to the effects of fluoride ions on the intensity of the discharges and melting of the coating. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码：827 / 838
页数：12
相关论文
共 41 条
[1]   Corrosion resistance of WE43 and AZ91D magnesium alloys with phosphate PEO coatings [J].
Arrabal, R. ;
Matykina, E. ;
Viejo, F. ;
Skeldon, P. ;
Thompson, G. E. .
CORROSION SCIENCE, 2008, 50 (06) :1744-1752
[2]   Corrosion behaviour of Mg/Al alloys in high humidity atmospheres [J].
Arrabal, R. ;
Pardo, A. ;
Merino, M. C. ;
Merino, S. ;
Mohedano, M. ;
Casajus, P. .
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION, 2011, 62 (04) :326-334
[3]   Corrosion behaviour of a magnesium matrix composite with a silicate plasma electrolytic oxidation coating [J].
Arrabal, R. ;
Pardo, A. ;
Merino, M. C. ;
Mohedano, M. ;
Casajus, P. ;
Matykina, E. ;
Skeldon, P. ;
Thompson, G. E. .
CORROSION SCIENCE, 2010, 52 (11) :3738-3749
[4]   Characterization of AC PEO coatings on magnesium alloys [J].
Arrabal, R. ;
Matykina, E. ;
Hashimoto, T. ;
Skeldon, P. ;
Thompson, G. E. .
SURFACE & COATINGS TECHNOLOGY, 2009, 203 (16) :2207-2220
[5]   A better understanding of PEO on Mg alloys by using a simple galvanostatic electrical regime in a KOH-KF-Na3PO4 electrolyte [J].
Barchiche, C. E. ;
Veys-Renaux, D. ;
Rocca, E. .
SURFACE & COATINGS TECHNOLOGY, 2011, 205 (17-18) :4243-4248
[6]   Electrochemical study of tailored sol-gel thin films as pre-treatment prior to organic coating for AZ91 magnesium alloy [J].
Barranco, V. ;
Carmona, N. ;
Galvan, J. C. ;
Grobelny, M. ;
Kwiatkowski, L. ;
Villegas, M. A. .
PROGRESS IN ORGANIC COATINGS, 2010, 68 (04) :347-355
[7]   Effects of Mn content and texture on fatigue properties of as-cast and extruded AZ61 magnesium alloys [J].
Bin Sajuri, Z ;
Miyashita, Y ;
Hosokai, Y ;
Mutoh, Y .
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES, 2006, 48 (02) :198-209
[8]   The effect of substrate composition on the electrochemical and mechanical properties of PEO coatings on Mg alloys [J].
Cakmak, Emrah ;
Tekin, Kadir C. ;
Malayoglu, Ugur ;
Shrestha, Suman .
SURFACE & COATINGS TECHNOLOGY, 2010, 204 (08) :1305-1313
[9]   Microstructural, corrosion and nanomechanical behaviour of ceramic coatings developed on magnesium AZ31 alloy by micro arc oxidation [J].
Dey, Arjun ;
Rani, R. Uma ;
Thota, Hari Krishna ;
Sharma, Anand Kumar ;
Bandyopadhyay, Payel ;
Mukhopadhyay, Anoop Kumar .
CERAMICS INTERNATIONAL, 2013, 39 (03) :3313-3320
[10]   Growth process of plasma electrolytic oxidation films formed on magnesium alloy AZ91D in silicate solution [J].
Duan, Hongping ;
Yan, Chuanwei ;
Wang, Fuhui .
ELECTROCHIMICA ACTA, 2007, 52 (15) :5002-5009
12345