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.
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.
To avoid corrosion damages by pitting the acid concentration should not exceed 50 g HCl per liter solution.
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).Kosher Certification No.: 81173637, company number: 0351
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