Anodisation with dynamic current control for tailored alumina coatingsShow others and affiliations
2016 (English)In: IOP Conference Series: Materials Science and Engineering, Institute of Physics Publishing (IOPP), 2016, Vol. 118, no 1, article id 012038Conference paper, Published paper (Refereed)
Abstract [en]
The anodic oxidation process is commonly used to refine the surface of aluminium and its alloys. Compared to the substrate, the alumina layers produced by anodising exhibit an increased hardness and chemical resistance. Thus, the corrosion and wear resistance are generally improved. The coatings are also electrically isolating and may serve decorative purposes. Applying a time-variant, dynamic electrical process control by pulse-current or current-steps is a promising approach to improve the coating properties, which is partially deployed in an industrial scale. In the present work, the influence of dynamic electrical process control on the coating properties is examined by means of a design of experiments (DOE). The effects of various electrolyte compositions and temperatures as well as processing time are considered with regard to coating thickness, hardness, wear resistance and the electrical energy consumption during the formation of the coatings. Information about the statistical significance of the effects of the parameters on the considered properties is obtained by an analysis of variance (ANOVA).
Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2016. Vol. 118, no 1, article id 012038
Series
IOP Conference Series: Materials Science and Engineering, ISSN 1757-8981 ; Volume 118, Issue 1
Keywords [en]
Alumina, Analysis of variance (ANOVA), Anodic oxidation, Coatings, Design of experiments, Electrolytes, Energy utilization, Hardness, Thickness measurement, Wear resistance, Aluminium and its alloys, Coating properties, Coating thickness, Corrosion and wear resistance, Electrical energy consumption, Electrical process, Electrolyte compositions, Statistical significance, Process control
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:hj:diva-51172DOI: 10.1088/1757-899X/118/1/012038ISI: 000376260700078Scopus ID: 2-s2.0-84971622470OAI: oai:DiVA.org:hj-51172DiVA, id: diva2:1507522
Conference
18th Chemnitz Seminar on Materials Engineering, 10 March 2016 through 11 March 2016
2020-12-082020-12-082020-12-08Bibliographically approved