Abstract
SYNOPSIS Rubber-to-steel bonded automotive components in temperate climates often suffer separation of the rubber from the steel, with corrosion evident on all exposed surfaces of the steel – including that originally bonded. The objective of this chapter is to clarify whether corrosion causes the bond to fail, or whether it merely attacks the metal exposed by the bond failure. This chapter shows that the phenomenon may be simulated in the laboratory, either by salt spray tests or simply by immersion in aerated salt solution. Since bond failure does not occur for rubber bonded to electrochemically passive substrates, such as nylon, and is greatly reduced in deionised water, it is concluded that it is electrochemical in origin. Possible mechanisms are discussed in the light of a review of similar phenomena observed with coatings for metal.
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