Most metal hot working processes tend to leave
a discoloring oxide layer or scale on the surface. Deposition of inorganic
impurities, stains, rust and scales from ferrous, cuprous, aluminium and
precious metal mostly as oxides hinder with further processes like extrusion,
rolling and galvanizing. In jewellery making, soldering and annealing processes
leave metal oxide residue that prevent polishing of ornaments. Such impurities
are cleaned with the help of diluted solution of acids. The method is called
pickling and the workpiece is dipped in a vat of acid solution popularly called
“Pickle Liquor”.
Hydrochloric acid replaced the commonly used
Sulfuric acid as the pickling liquor because it pickles much faster with minimum base metal loss. The aggressive
chloride ion in the acid is the key to high efficiency in the cleaning process.
It is used for cleaning metals with an
alloy content of 6% or less. An acid inhibitor must be added to the
pickling solution to prevent the metal from dissolving or becoming pitted. Such
a pickling acid solution is called “Inhibited HCL” and is a blend of
Hydrochloric acid solution in water (3% to 10%) and an acid corrosion inhibitor
which in itself is a blend of organic compounds that adsorb on the metal
surface during pickling.
Rodine 213 is a
premium organic blend of keto-amine complex substitutes with non-ionic
surfactants, alcohol and solvents especially designed to inhibit attack of
hydrochloric acid on metal surfaces during industrial operations like cleaning
and pickling. It is effective over a wide range of metal surfaces like Iron
& Steel, copper and brass. Rodine 213 is a high foaming formulation with a
high efficacy at dispersing grease deposits and is ideal for HCL based pickling
liquor solutions especially prior to plating.
It ensures metal surface protection during
processes involving elimination of lime deposits from boiler and pipework and
from evaporating plants, removal of oxide deposits from iron, steel, brass and
copper. Rodine 213 is free from chlorinated hydrocarbons and heavy metals like
arsenic and lead. It can be synergized with Hydrochloric acid pickling in
stipulated concentrations both by circulation method and by soak and rinse
method. Rodine 213’s exceptional strength and commendable heat stability makes
it an ideal acid inhibitor during enhancement of the pickling process by
pre-heating the equipments with the inhibited acid solution. It also acts as a
strong acid fume suppressant.
Its key
features can be summarized as follows:
·
Modifies metal surface
to prevent corrosion
·
Easy to use
·
Excellent wetting properties
for better cleaning
·
Effective fume suppression
·
Saves Zinc in galvanizing
(Plating)
·
Reduces metal loss
·
Enriches strength of pickling
acid bath, and reduces acid consumption
Rodine 213 has widespread industrial
application in industries such as Iron & Steel,
Power Station, Heavy Engineering Industries, Petrochemical & Refineries,
Sugar Processing Industry, Cement, Glass & Ceramic Industries to name a
few.
