Heat treated and as-plated electroless duplex Ni-P/Ni-B coatings: Evaluation of hardness and wear resistance

Gökce Dil, Ali Göksenli, Cagdas Calli, Faiz Muhaffel, Ali I. Aydeniz, Ahmed Yildiz*, Behiye Yüksel

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3 Atıf (Scopus)

Özet

The present work deals with the formation of Ni-P/Ni-B duplex coatings by electroless plating and evaluation of their hardness and wear resistance. The duplex coatings were prepared with Ni-P as the inner layer. To analyze the structure of the coatings, XRD analysis was carried out. According to the results, Ni-P and Ni-B coatings are amorphous in their as-plated condition and after applying heat-treatment at 450 °C for 1 h, both Ni-P and Ni-B coatings crystallize and produce nickel, nickel phosphide and nickel borides in the coatings. To determine the surface morphology and cross-section characteristics of the coatings, SEM observations were carried out and concluded that duplex coatings are uniform and good coherent exists between the duplex layers and the coatings are also connected closely to the substrate. The hardness of electroless nickel duplex coatings increased with applying heat treatment and reached maximum value at coatings annealed at 400 °C. To analyze the tribological properties, pin-on-disc tests were carried out. The wear track patterns on the coatings and on Al2O3 balls were then examined by optical microscopy and EDS. The friction coefficient and wear rate of the coatings were lower than the substrate steel. Friction coefficient decreased from 0.43 to 0.36 and wear resistance decreased from 11.3 to 6.4 by applying heat treatment at 450 °C for 1 h to duplex coatings.

Orijinal dilİngilizce
Ana bilgisayar yayını başlığıMaterials Science, Machinery and Energy Engineering
Sayfalar264-269
Sayfa sayısı6
DOI'lar
Yayın durumuYayınlandı - 2014
Etkinlik2013 International Conference on Materials Science, Machinery and Energy Engineering, MSMEE 2013 - , Hong Kong
Süre: 24 Ara 201325 Ara 2013

Yayın serisi

AdıAdvanced Materials Research
Hacim853
ISSN (Basılı)1022-6680

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???event.eventtypes.event.conference???2013 International Conference on Materials Science, Machinery and Energy Engineering, MSMEE 2013
Ülke/BölgeHong Kong
Periyot24/12/1325/12/13

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