Passivation occurs when a protective film of unreactive oxide forms on the surface of stainless steel because of its exposure to an oxygen-rich environment. It also involves elimination of exogenous iron or ferric compounds with the help of chemical dissolution, which is actually the initial process. The dissolution is brought about by usage of some mild oxidant that removes contamination without disturbing the integrity of the stainless steel itself, like nitric acid. The oxidant also speeds up the development of the oxide film.
We understand the significance of surface iron removal in order to impede corrosion and ensure satisfactory performance of components. In order to detect contamination of stainless steel that has been, is being and is yet to be passivated, Global Welding Technology provides Passivation Testing (PT) service for a vast range of manufacturing industries. Our PT service is highly advanced and can accurately detect unacceptable contaminants like rust, soil, iron, grease, oxide, metal chips, scale, carbonaceous chemical films, oil, particles, non-volatile residue and dirt. Every PT inspection is conducted according to the requirements of Australian Standards and other ASME, AWS, API, EN & ISO codes.
We have well-equipped laboratories and licensed & skilled experts for conducting the common Passivation Testing processes, including ferroxyl test, high humidity test, copper sulphate, salt spray test and black light test. After inspecting passivated stainless steel for contamination, we issue the results quickly and also provide certification of the testing done.