Abstract
This paper describes a systematic study into the initiation and propagation of cathodic delamination on pure iron, pure tin and industrially important tin and iron-tin intermetallic (FeSn and FeSn2) coatings for packaging steels, as a function of coating weight. Cathodic disbondment rates for an organic lacquer overcoat applied to the various metallic coatings are determined using an in-situ scanning Kelvin probe technique. Cathodic disbondment was not observed on pure tin and was found to propagate at reduced rates on the FeSn and FeSn2 intermetallic coatings, relative to pure iron. An explanation of these findings is given in terms of electrocatalytic activity of various metallic surfaces for the cathodic oxygen reduction reaction. It is shown that the relative susceptibility of Fe, Sn, FeSn and FeSn2 to cathodic disbondment increases with decreasing cathodic overpotential and is independent of metallic coating weight.
Highlights
It is proposed that peaks observed in the anodic going wave of the cyclic voltammogram for free tin is converted to an iron-tin (FeSn) seen in Figure 5d correspond predominantly to Fe(OH)[2] formation and it is postulated that the iron oxide governs the activity of the FeSn material
Tin is traditionally used for the corrosion protection of packaging steel
The aim of the current paper is to present a detailed study of the role of free tin and iron-tin intermetallic layers in resisting atmopheric corrosion, cathodic disbondment, as it affects lacquer coated packaging material
Summary
It is proposed that peaks observed in the anodic going wave of the cyclic voltammogram for FeSn seen in Figure 5d correspond predominantly to Fe(OH)[2] formation and it is postulated that the iron oxide governs the activity of the FeSn material.
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