Acid solutions are extensively used in industry, the most important applications are acid pickling, industrial acid cleaning, acid descaling and oil well acidizing. The commonly used acids are hydrochloric acid, sulphuric acid, nitric acid, etc [1][2]. Hydrochloric and sulphuric acids are the most difficult of the common acids to handle from the standpoints of corrosion and materials constructions. Extreme care is required in the selection of materials to handle the acid by itself, even in relatively dilute concentrations or in process solutions containing appreciable amount of hydrochloric acid. These acids are very corrosive to most of the common metals and alloys.The corrosion rate increased with the increase of the temperature and hydraulic acid concentration.
99%hcl is lesser corrosive than 38%. The available free oxygen is higher in 38%hcl than 100%hcl. depends on tafel extrapolation, the plain carbon steel itself enough to store 100%hcl, because it will form the stable oxide layer on the surface.yes it all depends on corrosion kinetics.
Dear Ananth Kumar,
i would be so grateful if you explain me the change of corrosion rate with increasing of hcl concentration up to 100% with mentioning the reason of changes. i got confused.
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