Effects of reagent purity on plasma electrolytic oxidation of titanium in an aluminate-phosphate electrolyte

被引：11
|
作者：
Aliasghari, S. [1 ]
Nemcova, A. [1 ]
Cizek, J. C. [2 ]
Gholinia, A. [1 ]
Skeldon, P. [1 ]
Thompson, G. E. [1 ]
机构：
[1] Univ Manchester, Sch Mat, Corros & Protect Grp, Manchester M13 9PL, Lancs, England
[2] Brno Univ Technol, Inst Mat Sci & Engn, Netme Ctr, Tech 2896 2, CS-61090 Brno, Czech Republic
来源：
TRANSACTIONS OF THE INSTITUTE OF METAL FINISHING | 2016年 / 94卷 / 01期
基金：
英国工程与自然科学研究理事会;
关键词：
Titanium; Plasma electrolytic oxidation; Electron microscopy; CORROSION-RESISTANCE; CERAMIC COATINGS; OXIDE COATINGS; WEAR-RESISTANCE; TI-6AL-4V ALLOY; MAGNESIUM; BEHAVIOR; FILMS;
D O I：
10.1080/00202967.2015.1121692
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The effect of reagent purity on AC plasma electrolytic oxidation of titanium in aluminate-phosphate-based electrolytes has been studied under constant rms current conditions. The resultant coatings were examined by high-resolution electron microscopy and X-ray diffraction, revealing rutile, Al2TiO5, alpha-Al2O3 and gamma-Al2O3, with an aluminium-enriched outer region and phosphorus-enriched band near the coating base. A lower purity of the electrolyte led to an erratic voltage response and delamination of coating material in scratch tests. A thin chlorine-enriched region near the substrate, attributed to the inward migration of chloride ions during coating growth, is suggested to be the cause of the delamination. Deliberate additions of chloride to the electrolyte resulted in highly porous coatings.
引用
收藏
页码：32 / 42
页数：11
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