Thermally sprayed metallic coatings and the corresponding potential applications for ships

Due to the peculiar serving condition of the ships, the onboard equipment is often out of order, resulting in reduced life cycle;meanwhile, the maintenance cost rises correspondingly. In this paper, the advantages and disadvantages of arc spraying, super-sonic flame spraying, and plasma spraying for metal-lic thermally sprayed coatings are summarized. It is found that supersonic flame spraying best fits for large area metallic coatings for new ships. Certain factors that affect the corrosion resistance, adhesion, and poros-ity of the coatings are discussed, with the applications of metallic coatings on the ship being introduced. Fi-nally, in accordance with the requirements of metallic coatings, it is suggested that the integrated technolo-gy of supersonic flame spraying for large area spraying on the new ship should be studied, and the specific working procedure is described. Also, in order to meet the demands of the applications of large area metal-lic coatings for new ships, it is important to use post-treatment technologies with sealing agent to reduce the porosity of metallic coating, thus increasing the adaptation of metallic coatings to corrosive environ-ments.