Abstract
Electroless nickel-boron coatings are good candidates for the protection of metals against abrasive wear. They are synthesized by an electrochemical process based on the reduction of nickel salts by a chemical reagent, without the use of electrical energy, allowing perfect coverage of, and respect for, dimension. The process can be applied to various metals and other substrates, provided the substrate is adequately prepared for plating. Their structure is linked to their boron content and their thermal history: as-deposited coatings present very small grain sizes and can be considered as nearly amorphous, while heat treated coatings present larger (but still nanometric) grain sizes and higher hardness.
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