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2. ENGINEERING AND TECHNOLOGY
Thermal Spray coatings have long been adopted as a surface modification technique. Unique in their ability to mechanically bond to the surface of most substrate materials, the Thermal Spray coatings offer a generic solution to improving mechanical, corrosion or tribo-corrosion properties of the affected substrate material. Of the available systems, Flame Spray techniques offer the simplest and most cost-effective method of applying these coatings. In the current study, an investigation was conducted into the comparative performance of a selection of these coating systems – a polymer coating, with various coating thicknesses, and a metallic coating - in a number of Corrosion Test environments, when applied to a Mild Steel Alloy. The effect of chlorides on the life-to-failure of these systems is predicted and reviewed. Electrochemical Impedance Spectroscopy and Immersion Testing were carried out, in conjunction with microscopic and metallographic studies. Using these combined methodologies, it has been shown that the efficacy of the Thermal Spray coatings reviewed is dependent on both the inherent nature of the coating material and the coating thickness.
Culliton, D., Kennedy, D., Betts, A., Concannon, P.:Thermal Spray Coatings: Effect of Selected Coating Parameters on Corrosion Resistance. MATRIB Conference, 2009, Croatia.