Effect of alumina content on wear behaviour of Ni−P−Al2O3(α) electroless composite coatings

Author: Alirezaei S.   Monirvaghefi S.M.   Salehi M.   Saatchi A.   Kargosha M.  

Publisher: Maney Publishing

ISSN: 1743-2944

Source: Surface Engineering, Vol.21, Iss.1, 2005-02, pp. : 60-66

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Abstract

Codeposition of alumina particles within a Ni–P matrix was investigated. These composite coatings were produced on AISI 1045 steel discs by an electroless process and then heat treated at 200, 400 and 600°C for 1 h. Wear resistance of the deposits was measured by the pin on disc method. Structural changes were evaluated by X-ray diffraction (XRD) analysis, and SEM was used to study the surface morphology, cross-sections of coatings, wear surfaces and debris. The volume of codeposited particles was determined using an image analysis system. The results showed that alumina content in the bath to 15 g L−1 led to an increase in both the hardness and the wear resistance of the coatings. It was also found that heat treatment at about 400°C can increase the hardness and wear resistance of these composite coatings to maximum values.