Pure water has no effect, but chlorides (and other salts),
even in small traces, are particularly harmful to stainless
steels; steels containing molybdenum are more convenient.
Normally without effect, it can still cause problems if it contains
certain types of impurities.
Natural Atmospheres, except for Marine Atmospheres
The higher the content of noble elements or surface polish,
the higher is its resistance to natural elements
Marine and industrial atmospheres
Chrome steels alter very slowly but generally molybdenum steels
constitute a better choice..
It attacks most industrial metals but stainless steels generally
resist very well to nitric acid after the passivation of it’s
surface: molybdenum is interesting only when the acid contains
Its resistance depends on its concentration and the presence
of oxidant impurities enhancing passivation. Generally, austenitic
variations containing molybdenum are the best.
Resistance is generally good, but not with certain impurities,
particularly hydrofluoric acid.
Corrosion may be catastrophic since these solutions,
commonly found in paper mills, contain a high degree of impurities.
Once again, molybdenum alloys are preferable.
Corrosion regularly increases with its concentration. Hydrochloric
acid should not be combined with Stainless steel.
They generally are less corrosive than mineral acids and acids
found in food industry ; acetic, citric, and oxalic acids have
no effect on the steel.
Cold solutions have no effect but concentrated and warm solutions
The behaviour is generally good, except when there are salts
such as chlorines; nitrates facilitate passivation and improve
Generally, there aren’t any corrosion problems, except
with certain products that contain natural or added sulphurous
components such as mustard and white wine.
They generally have no effect on stainless steels, except
if they are chlorinated: glues, soaps, tars, oil products, etc.
cause no problem.
Salts and other Melted Mineral Products
Alkaline products corrode all stainless steels, but nitrates,
cyanides and acetates won’t attack stainless steels. Most
salts and melted metals cause rapid damage.