Moskowitz, L N

Commercially available thermal spray coatings have seen limited use in corrosion applications due to the presence of interconnecting porosity and oxide networks. Use of vacuum chambers or post-treatments can eliminate these defects, but these methods are impractical on a large scale. If similar high quality coatings could be produced in atmosphere and without post-treatments, then thermal spray techniques would offer important advantages as a means of building and repairing process equipment. A modified HVOF process employing unique inert gas shrouding has resulted in highly dense, low oxide coatings of metallic alloys. These coatings were extensively evaluated for severe petroleum industry corrosion applications in laboratory and plant testing, with exposures as long as five years. Coatings of corrosion-resistant alloys, such as Type 316L stainless steel and Hastelloy C-276, were shown to act as true corrosion barriers. They were protective to underlying base metals in severe environments, and in most cases exhibited corrosion resistance comparable to the corresponding wrought alloy. The process was called up for on-site plant use, and successfully applied to numerous corrosion problems in petroleum industry plant equipment. Significant technical and economic advantages can be realized by use of thermal spray coatings to sole plant equipment problems.

Descriptors: Chemical processing equipment | Coating | Carbon steels | Flame spraying | Austenitic stainless steels | Coatings | Nickel base alloys | Superalloys | Protective coatings | Corrosion resistance

Source: http://md1.csa.com/partners/viewrecord.php?requester=gs&collection=TRD&recid=199212581682MD&q=the+problem+of+petroleum+industry&uid=791269195&setcookie=yes

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