Abstract

Abstract: Microindentation hardness testing using Vickers or Knoop indenters conducted on electroless nickel–phosphorus (Ni–P) deposits can be used to analyse their hardness evolutions in relation to their deposit phosphorus contents as well as different heating temperatures at isothermal and linear heating conditions. The deposit hardness increases with decreasing phosphorus content at as-deposited condition, and can be enhanced by appropriate heating. The microindentation testing on the cross-sections of the deposits shows variations of hardness across the deposit depth. Scanning electron microscopy (SEM) analysis shows that the lamellar structure in the cross-sections of the as-deposited coatings tends to disappear, and agglomeration occurs when the heat-treating temperature is increased.

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