Silane based chromate replacements for corrosion control, paint adhesion, and rubber bonding

Abstract

An overview is given of the use of silanes for corrosion control of metals and bonding of silane treated metals to paint systems and rubber compounds. Examples are given of corrosion protection of cold rolled steel, galvanised steel, aluminium, and magnesium, both painted and unpainted. Emphasis in this work has been on the use of bis-silanes rather than the conventional mono-silanes. It is shown that mixtures of a bis-amino and a bis-polysulphur silane work with a wide range of metals and paint systems. A model is described which is largely based on electrochemical impedance spectroscopy (EIS) measurements.