Effects of tungsten carbide thermal spray coating by HP/HVOF and hard chromium electroplating on AISI 4340 high strength steel

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorNascimento, Marcelino P
dc.creatorSouza, Renato C
dc.creatorMiguel, Ivancy M
dc.creatorPigatin, Walter L
dc.creatorVoorwald, Herman J.C
dc.date2014-05-27T11:20:15Z
dc.date2016-10-25T18:17:01Z
dc.date2014-05-27T11:20:15Z
dc.date2016-10-25T18:17:01Z
dc.date2001-04-16
dc.date.accessioned2017-04-06T00:59:25Z
dc.date.available2017-04-06T00:59:25Z
dc.identifierSurface and Coatings Technology, v. 138, n. 2-3, p. 113-124, 2001.
dc.identifier0257-8972
dc.identifierhttp://hdl.handle.net/11449/66497
dc.identifierhttp://acervodigital.unesp.br/handle/11449/66497
dc.identifier10.1016/S0257-8972(00)01148-8
dc.identifier2-s2.0-0035897255
dc.identifierhttp://dx.doi.org/10.1016/S0257-8972(00)01148-8
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/888059
dc.descriptionIn cases of decorative and functional applications, chromium results in protection against wear and corrosion combined with chemical resistance and good lubricity. However, pressure to identify alternatives or to improve conventional chromium electroplating mechanical characteristics has increased in recent years, related to the reduction in the fatigue strength of the base material and to environmental requirements. The high efficiency and fluoride-free hard chromium electroplating is an improvement to the conventional process, considering chemical and physical final properties. One of the most interesting, environmentally safer and cleaner alternatives for the replacement of hard chrome plating is tungsten carbide thermal spray coating, applied by the high velocity oxy-fuel (HVOF) process. The aim of this study was to analyse the effects of the tungsten carbide thermal spray coating applied by the HP/HVOF process and of the high efficiency and fluoride-free hard chromium electroplating (in the present paper called 'accelerated'), in comparison to the conventional hard chromium electroplating on the AISI 4340 high strength steel behaviour in fatigue, corrosion, and abrasive wear tests. The results showed that the coatings were damaging to the AISI 4340 steel behaviour when submitted to fatigue testing, with the tungsten carbide thermal spray coatings showing the better performance. Experimental data from abrasive wear tests were conclusive, indicating better results from the WC coating. Regarding corrosion by salt spray test, both coatings were completely corroded after 72 h exposure. Scanning electron microscopy technique (SEM) and optical microscopy were used to observe crack origin sites, thickness and adhesion in all the coatings and microcrack density in hard chromium electroplatings, to aid in the results analysis. © 2001 Elsevier Science B.V. All rights reserved.
dc.languageeng
dc.relationSurface and Coatings Technology
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectAbrasive wear
dc.subjectCorrosion
dc.subjectFatigue
dc.subjectHard chromium electroplating
dc.subjectHP/HVOF
dc.subjectTungsten carbide thermal spray coating
dc.subjectChemical resistance
dc.subjectChromium
dc.subjectCoatings
dc.subjectFatigue testing
dc.subjectOptical microscopy
dc.subjectScanning electron microscopy
dc.subjectTungsten
dc.subjectWear of materials
dc.subjectAbrasive wear test
dc.subjectTungsten carbide thermal spray coatings
dc.subjectElectroplating
dc.subjectcoating
dc.subjectcorrosion
dc.subjectelectroplating
dc.subjectfatigue
dc.subjectspray
dc.subjecttungsten carbide
dc.titleEffects of tungsten carbide thermal spray coating by HP/HVOF and hard chromium electroplating on AISI 4340 high strength steel
dc.typeOtro


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