Description

A highly efficient inhibitor formulation for the protection of metal materials during the chemical cleaning or pickling with hydrochloric acid and mixtures of hydrochloric acid/hydrofluoric acid at temperatures up to 90°C. 

Benefits

• Effective at temperatures up to 90 °C
• For cast iron the maximum working temperature is 40 °C
• For Hydrochloric Acid and Mixtures of Hydrochloric Acid/Hydrofluoric
• Dissolves immediately when added to diluted or concentrated hydrochloric acid
• Contains a combination of specifically acting inhibitors and special surfactants with a high wetting effect. A quick wetting of the surfaces to be cleaned is ensured by reducing the interfacial tension.
• The dissolution of mill scales is not impaired by LITHSOLVENT 620.
• LITHSOLVENT 620 inhibits the corrosion of the following materials in the range of temperature mentioned above:
  • standard steel
  • special steel (e.g. superheater steel and low temperature resistant steel)
  • alloys on copper basis.
  • Cast iron is protected up to max. 40°C only.

In the table below the corrosion rates at 5 % HCl at 60°C and 75°C for steel material St 37 at a duration of action of 3 hours with and without the inhibitor LITHSOLVENT 620 are indicated as example for the good protection against corrosion.

		Attack in g/m²·h	Attack in g/m²·h
% HCl	°C	without Inhibitor	with 2.5 g/l LITHSOLVENT 620
5	60	75	0,9
5	75	550	1,5

Aluminium and light metal alloys as well as zinc, tin and chrome are not sufficiently protected.
For cast iron the max. working temperature is 40°C.