Effective Sulfuric Acid Pickling with Rodine 85

Long term use of metal components in

industries often makes them susceptible to

formation of rust and surface distortion by

scaling. In order to maintain surface quality

and remove rust, acid treatment is

employed. The metal parts are dipped in

acid baths to oxidize and remove hard scales

and rust layers. But since all acids have a

corroding tendency with metals, acid

treatment forms a root cause for concern

particularly due to abrasive and corrosive

loss of precious base metal leading to

surface pitting and distortion.

Acid inhibitors are administered in acid pickling baths to prevent loss of base metal after proper

pickling. It also helps to extend the life of acid baths. Using of inhibitor in acid solution limits the acid

attack on base metal, therefore minimizing base metal loss. A potent acid inhibitor helps to allevate acid

attack on the base metal once the scale has been removed, lending protection to the surface and

optimizing acid utilization.

Rodine 85 serves as a soluble, low foaming, liquid corrosion inhibitor formulated for use in conventional

sulfuric acid pickling operations. It is an amalgamation of 1,3-Diethyl Thiourea, Formaldehyde,

substituted Triazine & O-Toluidine, Propargyl Alcohol and detergent. Rodine 85 is effective on any type

of steel, and can be used at any acid concentration. Rodine 85 is an effective inhibitor for phosphoric

and acetic acids, as well as sulfamic, citric, oxalic, and sodium bisulfate solutions in pickling and

industrial cleaning operations.

Rodine 85 dosage greatly depends on the type of metal, the temperature of operation and the sequence

of cleaning operation. The recommended amount of Rodine 85 to be used for pickling is always given in

percent by volume of the concentrated acid, regardless of the degree of acid dilution used. RODINE 85

should be used at a concentration ranging from 0.05 to 0.30 percent by volume of the diluted acid

regardless of the degree of acid dilution used. In addition, it is recommended that Rodine 85 inhibitor be

used at a concentration not less that 0.5% by volume of the concentrated liquid acid or not less that

0.5% by weight of the concentrated solid acid, regardless of the temperature of the industrial cleaning

operation.

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