Every stainless steel cargo tank needs to be passivated, but it can be a simple process performed with a very basic system. Stainless steel can corrode in service if there is contamination of the surface. Both pickling and passivation are chemical treatments applied to the surface of stainless steel to remove contaminants and assist the formation of a continuous passive chromium oxide film. Pickling and passivation are both acid treatments and neither will remove grease or oil. If the steel is dirty, it may be necessary to use a detergent or alkaline cleaning before pickling or passivation.

We can assist our clients to supervise passivation process and/or carry out passivation procedures of stainless steel cargo tanks on board ship. We can also advise on the consequential time period necessary for the stainless steel to build up its passive layer again. Cargo tanks will look like new afterwards.

We can provide information regarding correct passivation procedure of stainless steel after highly corrosive cargoes, like sulphuric and phosphoric acid. TOCPRO experts have done impressive research work regarding different means of recovery of stainless steel passive layer. Information of passivation by means of nitric acid, citric acid, pickling gels and pastes can be introduced in operational procedures. Training and theoretical course for ship’s crew can be elaborated by our consultants. We can advise our clients how to perform passivation in the most economical way to achieve best results.  Our experience is based on the real life situations.