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·hAttack in g/m²·h
         % HCl°Cwithout Inhibitorwith 2.5 g/l LITHSOLVENT 620
         56075 0,9
         575550 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.

          Dosing, Addition

          In general the dosing rate amounts to 2.5 kg LITHSOLVENT 620/m3 diluted cleaning or pickling acid. If the inhibitor should be added into the concentrated acid, 1.5 kg LITHSOLVENT 620 have to be dosed per 100 kg acid. The duration of action of the inhibited acid on the materials should not exceed 6 hours.

            At temperatures above 80°C the dosing rate should be increased to 5 kg LITHSOLVENT 620 per m³ cleaning solution.
            To avoid corrosion damages by pitting the acid concentration should not exceed 50 g HCl per liter solution.
              After cleaning the plant and apparatus should be carefully rinsed with water until they are free from acid.

                Technical data

                Description:colorless to yellowish liquid
                Density at 25°C (g/cm3):approx. 1
                pH-Value (100 g/l water):6 - 8
                Solubility in acids and water:miscible

                Packing

                PE-cans 60kg
                barrels:200kg 
                containers:1.000kg 

                Storage

                In closed original packages LITHSOLVENT 620 is storable for at least two years. Protect from frost.

                  Notes. References

                  In case of proper application LITHSOLVENT 620 complies with the requirements of the German Food and Feed Code (LFGB, revised version by announcement of 15.09.2021).
                    Halal certification number: C-790-60-16-XXX
                    Kosher Certification No.: 81173637, company number: 0351

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