Acid cleaning agents
Cleaning agents with a pH-value from
0 to 6. The combination of surfactants and acids effectuate a good cleaning
of inorganic (mineral) soiling. Acidic cleaning is routinely used to remove
scale, rust, and oxides from metals. The cleaners may contain mineral acids
(hydrofluoric, sulfuric, phosphoric, nitric), chromic acids, or organic acids
(acetic or oxalic). They also may contain detergents, chelating agents, and
small amounts of water-miscible solvents. The choice of acid and additives depends
on the type of metal to be cleaned and the type of soil to be removed.
Hydrogen embrittlement can be caused in some metals by exposure to some acids.
Heat treating and choice of acid can reduce or eliminate the embrittlement.
Persons using acidic cleaners will need protection from the fumes, as well as
gloves and eye protection. Waste disposal involves pH adjustment and may require
removal of some soil components. The use of chelating agents can make the removal
of dissolved metals from the used cleaner very difficult. .
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