Abstract
High-boron (7–9wt%) electroless nickel-coatings were synthesized on mild steel substrates by modification of the plating conditions of a mid-boron (5–6wt% B) plating bath.They were fully characterized and compared when possible with the coatings obtained in the usual operating conditions, before and after a heat treatment at 400°C for 1h in a protective atmosphere.The morphology of the coating was similar to mid-boron coatings and left unchanged by heat treatment. Similarly, most properties of the as-deposited coatings were similar for mid and high-boron coatings.However, the effect of heat treatment was very different on both types of coatings: while mid-boron coatings crystallized fully in the Ni3B system, high-boron was multiphased. The coatings also presented a difference in terms of hardness behavior with a very important increase for the mid-boron coatings and lesser modification in the case of high boron. The abrasive wear resistance of both kinds of coatings was similar before heat treatment and high-boron coatings had a slightly better behavior after heat treatment. However, the sliding wear behavior of mid-boron coatings is significantly better than that of high-boron electroless nickel.
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