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5. Effect of heat treatment on electroless nickel-boron coatings
As expected, electroless nickel-boron coatings without special treatment show a metastable structure that does not correspond to that predicted by the nickel-boron phase diagram for these boron contents. This is because the solubility of boron in nickel at room temperature is extremely low, and numerous intermetallic compounds (such as Ni 2 B, Ni 3 B, Ni 4 B 3 ...) can be formed as a function of the boron content of the mixture . The hardness of these borides, some of which have crystal structures...
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Effect of heat treatment on electroless nickel-boron coatings
Comparison with nickel-phosphorus coatings
Bibliography
Regulations
ELV (End of Life Vehicles).
European Directive 2000/53/EC on end-of-life vehicles stipulates that "materials and components for vehicles put on the market after 1 er January 2003 must not contain lead, cadmium, mercury or hexavalent chromium. The tolerance is 0.1% for lead and 0.01% for cadmium, provided that these substances are not intentionally introduced."...
Patents
Mc Comas, E. Nodular nickel boron coating, US patent N° 20040111947, 2004. (Universal Chemical Technologies Inc., Florida.
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