DE471172C - Procedure for removing rust on iron parts - Google Patents

Description

Process for removing rust from iron parts It is known that when removing rust from iron parts by treating finite acids Post-rusting occurs unless a particularly careful post-treatment is carried out will.

It has now been found that you can rust easily and with great care of iron with the help of sulphurisation products from anthracene residues or from crude anthracene un-. can be removed by treating the objects to be cleaned with a solution of the treated sulfation products mentioned. After a relatively short time, their Duration varies depending on the degree of corrosion, the objects can be in perfect condition remove rust-free, shiny metal condition from the bath. A rubbing, i.e. mechanical Removing rust is usually not necessary. Be thorough with the items Washed with water and dried, this occurs even after several weeks of free storage Do not rust afterwards, rather the original bright metal appearance is retained.

By adding mineral acids, hydrochloric acid, or others organic acids, e.g. B. OYalic acid, you can use the necessary for the treatment Significantly shorten the time without the iron having a greater tendency to rust shows. A particularly good effect is achieved if you also use the iron Treatment with oils or fats, e.g. B. in the form of an emulsion for use can come subject, taking the oils and fats simultaneously with the above Sulphation products are brought into action.

Example In an aqueous solution containing 8 percent of the sulphonation product Contains anthracene residues, the rust to be removed, with constant stirring Iron pieces inserted and left in them until - completely - rust removal. The duration of the rust removal depends primarily on the degree of corrosion of the iron and still dependent on the concentration of the bath. After removing the iron pieces from the bath, these are rinsed thoroughly with water and dried. By addition from 3 percent hydrochloric acid, the time required for rust removal increases to about Half price reduced.

Claims (1)

PATENT CLAIM: Process for removing rust from iron parts, characterized by the treatment of the objects to be cleaned finitely sulphonation products of anthracene residues or crude anthracene alone or together with other organic or mineral acids, in the latter case considerable amounts of the sulphonation product are present compared to the mineral acids, possibly simultaneously with oils or fats.