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| Abstract No.: |
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Scheduled at:
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Tuesday, April 30, 2024, Yellow 1 12:20 PM
Pre- & Post-Treatment
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| Title: |
New sealer technology for improved corrosion performance and dielectric properties
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| Authors: |
Bernard Larouche* / Oerlikon Metco Woka GmbH, Germany
Daniel Garcia / Oerlikon Metco (Canada) Inc., Canada
Ville Eronen/ Oerlikon Metco Europe GmbH, Finland
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| Abstract: |
Thermal spray coatings, by their nature, are frequently more or less porous and can contain microcracks in their microstructure. When these porosities are interconnected and extend to the substrate, corrosive media can seep through these coating defects resulting in corrosion of the base material. To overcome this problem, sealers can be used as a post treatment to fill open porosities and cracks in the coating and thus form a protective barrier to corrosive or oxidizing products. To provide efficient corrosion protection for coatings, sealers must have low viscosity, high surface tension as well as good wettability in order to ensure good penetration of pores and cracks via capillary effect. In this study, newly developed sealers to improve corrosion and dielectric performance in thermal spray coatings have been investigated. Corrosion performance of sealed and unsealed thermal spray coatings was evaluated by neutral salt spray test and electrochemical measurements. In addition, effects to dielectric performance of plasma-sprayed Al2O3 coatings sealed with new sealers were also investigated using breakdown strength measurements. Results indicate a significant improvement of corrosion resistance and dielectric performance of the sealed coatings.
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