Wear Assessment Of Tin And Tin Alloy Coatings
Author(s)
W. P.-W. Lam, K. Mao, C. Kerr & T. A. Stolarski
Abstract
Tin and tin alloys have traditionally been used as coating materials for a variety
of functions, e.g. decorative, solderable and corrosion resistant, but rarely in
applications that require physical durability, owing to the soft nature of tin.
Although it has been reported that some alloys of tin are comparatively harder,
these materials have traditionally been used as corrosion resistant coatings and
there has been little research conducted on exploring their physical properties.
This paper aims to demonstrate the range of durability augmentation achieved
from alloying tin with copper and nickel in coatings electrodeposited onto steel
by assessing the degree of coating removal caused by wear from a sliding
ceramic ball contact on the coating surface. The degree of wear is measured by
the level of iron detected (i.e., where coating removal has resulted in the
exposure of the underlying steel), via EDX, and this is correlated with 1)
different loads (10 – 50 N at ten Newton increments) at which the ceramic ball is
applied; 2) the thickness of the tin/tin alloy deposits (2, 5 & 10 microns) and 3)
the wear testing duration (1 – 8 hours at one hour increments). The results are
then presented in the form of a matrix. The study confirmed that tin performed
poorly, and revealed significant improvements when tin is alloyed with nickel or
copper.
Keywords: sliding wear, coating, SEM/EDX, tin, tin-nickel, tin-copper.
1 Introduction
This paper assesses the possibility of using tin and tin alloy coatings in an
application not previously considered before. The suitability of the materials in
question is evaluated using a novel method, where the degree of coating removal
is quantified. Concluding comments and suggestions for further work are
presented at the end of the paper.
Keywords
sliding wear, coating, SEM/EDX, tin, tin-nickel, tin-copper.
Related Book
Other papers in this volume
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