{"title":"Study on properties of 6061 aluminum alloy coating by two-stage plasma electrolysis in two completely different electrolytes","authors":"","doi":"10.1016/j.surfcoat.2024.131152","DOIUrl":null,"url":null,"abstract":"<div><p>In this paper, an innovative two-stage plasma electrolysis technology was used to prepare a coating with improved properties, and the growth mechanism, wear and corrosion resistance of it were studied. In the first stage, 6061 aluminum alloy discs were fluoridated in a non-aqueous electrolyte (NH<sub>4</sub>F-EG) to get a plasma electrolytic fluorination (PEF) coating, and then in the second stage, the samples with fluorinated coatings were transferred to a phosphate electrolyte for plasma electrolytic oxidation (PEO) treatment, resulting in a new coating. Also, two PEF coatings and PEO coatings obtained by processing in a single electrolyte were set up. The roughness, hardness, microstructure, and material composition were analyzed using a surface roughness meter, nano-indentation instrument, scanning electron microscope (SEM), energy dispersive spectrometer (EDS), X-ray diffractometer (XRD), and X-ray photoelectron spectroscopy (XPS). Furthermore, their wear resistance was evaluated through friction tests, and their corrosion resistance was assessed using corrosion tests. The results demonstrate that FF has a lower coefficient of friction (COF) and abrasion width under dry friction than conventional OO, but it has a higher coefficient of friction and abrasion width under water and oil lubrication than under dry friction. Furthermore, FF has a lower corrosion potential and higher corrosion current density than OO. However, FO fully combines and enhances the advantages of both coatings with lower energy consumption, exhibiting the highest corrosion potentials as well as the lowest friction coefficients, abrasion widths, and corrosion current densities in three different samples.</p></div>","PeriodicalId":22009,"journal":{"name":"Surface & Coatings Technology","volume":null,"pages":null},"PeriodicalIF":5.3000,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Surface & Coatings Technology","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0257897224007837","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, COATINGS & FILMS","Score":null,"Total":0}
引用次数: 0
Abstract
In this paper, an innovative two-stage plasma electrolysis technology was used to prepare a coating with improved properties, and the growth mechanism, wear and corrosion resistance of it were studied. In the first stage, 6061 aluminum alloy discs were fluoridated in a non-aqueous electrolyte (NH4F-EG) to get a plasma electrolytic fluorination (PEF) coating, and then in the second stage, the samples with fluorinated coatings were transferred to a phosphate electrolyte for plasma electrolytic oxidation (PEO) treatment, resulting in a new coating. Also, two PEF coatings and PEO coatings obtained by processing in a single electrolyte were set up. The roughness, hardness, microstructure, and material composition were analyzed using a surface roughness meter, nano-indentation instrument, scanning electron microscope (SEM), energy dispersive spectrometer (EDS), X-ray diffractometer (XRD), and X-ray photoelectron spectroscopy (XPS). Furthermore, their wear resistance was evaluated through friction tests, and their corrosion resistance was assessed using corrosion tests. The results demonstrate that FF has a lower coefficient of friction (COF) and abrasion width under dry friction than conventional OO, but it has a higher coefficient of friction and abrasion width under water and oil lubrication than under dry friction. Furthermore, FF has a lower corrosion potential and higher corrosion current density than OO. However, FO fully combines and enhances the advantages of both coatings with lower energy consumption, exhibiting the highest corrosion potentials as well as the lowest friction coefficients, abrasion widths, and corrosion current densities in three different samples.
期刊介绍:
Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance:
A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting.
B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.