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Wear Behaviour of Electroless heat Treated Ni-P Coatings as Alternative to Electroplated hard Chromium Deposits

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العنوان: Wear Behaviour of Electroless heat Treated Ni-P Coatings as Alternative to Electroplated hard Chromium Deposits
المؤلفون: Felipe Samuel Goettems, Jane Zoppas Ferreira
المصدر: Materials Research, Vol 20, Iss 5, Pp 1300-1308 (2017)
بيانات النشر: Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol), 2017.
سنة النشر: 2017
المجموعة: LCC:Materials of engineering and construction. Mechanics of materials
مصطلحات موضوعية: Metallic coatings, Wear, Nickel electroless, Heat treatment, Hard chromium, Materials of engineering and construction. Mechanics of materials, TA401-492
الوصف: In this present study was evaluated the influence of heat treatment on the wear resistance of electroless high phosphorus nickel coating (9-10% P wt.). In addition, both untreated and treated Ni-P deposits were then compared to electroplated hard chromium coatings in terms of wear behaviour. Three different heat treatment conditions were performed at temperatures of 320ºC, 400ºC and 500ºC under different holding times. The selection of the heat treatment conditions was chosen considering the results obtained by a differential scanning calorimetry (DSC) analysis. The wear behaviour of the Ni-P samples was investigated through a non-lubricated "ball on plate" test carried out against an Al2O3 counter-face. After an analysis of the friction coefficient, microstructure of the worn surface, width and chemical composition of the wear track, was possible to conclude that the heat treatment affect positively the wear resistance of Ni-P coatings. Treatment conditions of 320ºC with 9 hours holding time and 400ºC with 1 hour holding time showed the best results due to a structural change from amorphous supersatured solid solution of phosphorus in nickel to a crystalline structure of nickel crystallites and nickel phosphides (Ni3P) occurred between 320ºC and 360ºC that was verified after x-ray diffraction analysis. Moreover, Ni-P heat treated coatings showed better results when compared to electroplated hard chromium deposits, hence acting as a natural alternative for chromed coatings.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 1516-1439
1980-5373
Relation: http://www.scielo.br/pdf/mr/v20n5/1516-1439-mr-1980-5373-MR-2017-0347.pdf; http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392017000501300&tlng=en; https://doaj.org/toc/1516-1439
DOI: 10.1590/1980-5373-mr-2017-0347
URL الوصول: https://doaj.org/article/9646036ed8d84893b36c50f768d93263
رقم الانضمام: edsdoj.9646036ed8d84893b36c50f768d93263
قاعدة البيانات: Directory of Open Access Journals
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