Cleaning, pickling and passivation of stainless steel marine cargo tanks - the review discusses and explains why is it needed and how it is carried out. To summarise, the effect of cleaning and degreasing is to remove contaminants insoluble in acids. The effect of pickling is to remove acid soluble oxides, free iron and uniformly dissolve a very thin layer of the whole surface. The new surface can be described as 'virgin steel' with enhanced chromium content. The effect of passivation is to form a uniform, closed chromium oxide surface film, to maximize the corrosion resistance offered by the material. Although essentially a purely chemical process, pickling and passivation can be equated to a full re-coating of mild steel tanks, with the added advantage that, if carefully maintained, the passivating chromium oxide film is 'self-healing'.
Pickling and passivation
Beizen und Passivierung
Oils & Fats International ; 18 , 2 ; 21-25
2002
3 Seiten, 2 Bilder
Article (Journal)
English
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