Research Papers: Coatings and Solid Lubricants

Tribological Characterization of Electroless Ni–B Coatings Formed on Commercial Purity Magnesium

[+] Author and Article Information
E. Correa

Materiales para el Mobiliario—MATERMOB,
Centro Tecnológico del Mobiliario,
Servicio Nacional de Aprendizaje SENA,
Calle 63 No. 58B-03,
Itagüí 055410, Colombia
e-mail: ecorrea54@misena.edu.co

J. F. Mejía, J. G. Castaño, F. Echeverría, M. A. Gómez

Centro de Investigación,
Innovación y Desarrollo de
Universidad de Antioquia UdeA,
Calle 70 No. 52-21,
Medellín 050010, Colombia

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received July 22, 2016; final manuscript received January 23, 2017; published online May 26, 2017. Assoc. Editor: Sinan Muftu.

J. Tribol 139(5), 051302 (May 26, 2017) (9 pages) Paper No: TRIB-16-1231; doi: 10.1115/1.4036169 History: Received July 22, 2016; Revised January 23, 2017

Ni–B coatings have been deposited directly on commercial purity magnesium and evaluated by means of sliding wear and friction testing. The nickel and boron are distributed throughout the whole thickness of the coating. Parametric optimization has been carried out using the design of experiment based on Taguchi analysis. The friction coefficients of the coatings vary between 0.01 and 0.3, depending on the evaluated conditions. The lowest wear rate of the coating was 0.19 × 10−5 mm3 N−1 m−1. Wear and friction coefficient maps of Ni–B electroless coatings formed on magnesium surfaces are reported. Nanoparticles present in the lubricating fluid act as a third wear body increasing the wear of the electroless coating

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Fig. 1

(a) Scanning electron micrograph (secondary electrons) in plan, (b) XRD pattern, and (c) GDOES elemental depth profile of pure magnesium after 60 mins of immersion in an alkaline Ni–B electroless bath

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Fig. 2

Effect of applied load, sliding velocity, and lubricating fluid on (a) friction coefficient and (b) wear rate of pure magnesium after 60 mins of immersion in an alkaline Ni–B electroless bath

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Fig. 3

Coupons of pure magnesium after 60 mins of immersion in an alkaline Ni–B electroless bath showing the wear tracks of samples. Each image number corresponds to the experiment number assessed in Table 6.

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Fig. 4

Scanning electron micrographs (secondary electrons) of wear tracks and worn surfaces observed after sliding wear tests on electroless Ni–B coatings formed on pure magnesium, the images on columns (b) and (c) are enlargements of those on column (a)

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Fig. 5

EDS maps of the wear tracks on the electroless Ni–B coatings formed on pure magnesium: (a) Experiment no. 1, (b) experiment no. 5, and (c) experiment no. 9




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