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How an Acid Inhibitor Protects Steel

Here’s a visual (and dramatic) demonstration in our labs of how a hot acid bath will eat away at the steel your company works hard to produce. Use of one of our acid inhibitors (in this case, Activol® 1803) in the pickling process significantly reduces your surface pitting and metal loss to the acid.

Why Pickling Processes Require an Acid Inhibitor

The video below graphically demonstrates what happens to steel in hot HCl, once the scale is removed. (Remember that 90% of the scale is removed early on in the pickling process; the last tank or maybe tank and a half is necessary to remove the edge scale, which is the most difficult scale to remove.)

Therefore, for most of the process, the strip is actually descaled and is being dissolved in the acid in the form of iron chloride. The result is that the strip becomes overpickled, your yield is degraded, and the HCl is being consumed needlessly, thereby increasing your operating costs.


Learn More About Acid Inhibitors

In this video, the metal used is descaled, grade 1011 steel in a bath of hydrochloric acid. The acid is eating away at the steel at a remarkable rate until the Activol® 1803 is added to protect the steel from the pickling process. Learn more about acid inhibitors (in general) and our acid inhibitors (in particular). Looking for more corrosion inhibitors? Try our Steelgard products!

Find the Perfect Acid Inhibitor

If you have additional questions, or need assistance to determine which of our acid inhibitor products will work best for your particular process,  give us a call: 215-324-4000. We also offer special custom formulations if your needs are unique. We have over 79 years of experience and can make your manufacturing process run a little smoother.

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Hamico® 8936 – Rinse Aid

Hamico® 8936 Rinse Aid is an additive for rinse systems after pickling steel using hydrochloric or sulfuric acids. Hamico® 8936 Rinse Aid prevents the formation of iron hydroxide slimes which typically occur in rinse tanks and prevents surface discoloration on steel exiting the bath. Hamico® 8936 Rinse Aid complexes ferrous iron, thus preventing it from re-depositing.

Hamico® 8936 Rinse Aid buffers the rinse water against sudden drops in pH, due to acid carryover from pickling tanks and protects from flash rusting after rinse operations. It may be used in hot or cold baths.

Hamico® 8936 Rinse Aid is easy to handle and is not corrosive to the skin.

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Hamico® 8934 – Rinse Aid

Hamico® 8934 Rinse Aid is a stain preventing additive for rinse systems for use after hydrochloric or sulfuric acid pickling operations. It is an acidic product possessing corrosion protection and wetting. It is designed to eliminate the brown or reddish stains often experienced on steel exiting a continuous pickler. It eliminates the formation of iron hydroxide slimes which accumulate in rinse tanks as a result of acid bath carryover. Hamico® 8934 Rinse Aid is compatible with waste treatment processes where removal of metals like iron, copper, zinc, and chromium must be accomplished to meet limits for effluents.

This product prevents carryover products from depositing on the immersed steel surface and protects the rinsed surface before drying occurs. Hamico® 8934 Rinse Aid is low-foaming to make water treatment and disposal easier and employs a tracer to make it easy to make concentration determinations using a test kit.

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Immunol® 1228-2 – NDT Additive

Immunol® 1228-2 is an additive for use in non destructive test applications such as ultrasonic inspection or hydrostatic (or pressure) testing. It provides rust protection and reduced surface tension to water baths used for immersion testing of these types. Is recommended for systems constructed of (or used for testing) steel and aluminum. This version provides much lower surface tension to water than Immunol® 1228. Protection against flash rusting and short term indoor storage provided. Product improves the effect of ultrasonic waves from transducer. It improves the liquid media by eliminating air pockets more rapidly. (For systems with agitation or rapid re-circulation, use Immunol® 1228)

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Activol® 8402 Economical Acid Inhibitor

Activol® 8402 is the most economical member of a line of hydrochloric acid pickling bath additives formulated for continuous hydrochloric picklers, including deep bath conventional and shallow dynamic systems. It provides all the requirements of a good pickling inhibitor including: descaling ability, quality protection, excellent rinsability, reduced acid consumption, reduced gage and metal loss, durability, reduced hydrogen embrittlement, fume reduction and results in uniformly bright pickled surfaces.

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Rainkote® NC – Stain Prevention Additive

Rainkote® NC is an additive to prevent line-stop stain in the rinse section of hydrochloric or sulfuric acid pickling lines. It is an acidic product possessing corrosion protection and wetting. It is designed to eliminate brown or reddish stains often experienced on the steel strip exiting a continuous pickler. It eliminates the formation of iron hydroxide slimes which accumulate in rinse tanks as a result of acid bath carryover.

Due to its non-chelating components, it is compatible with waste treatment processes where removal of metals like iron, copper, zinc, and chromium must be accomplished to meet limits for effluents.

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Immunol® 438 – Magnetic Inspection NDT Additive

Immunol® 438 is an additive for water when water is used in place of solvents to suspend pastes and powders as in magnetic particle inspection, i.e., Magnaflux and Magnaglo. Immunol® 438 is also an additive to hydrostatic test solutions and provides rust inhibition, dispersion and wetting to steel, iron, copper, brass and zinc surfaces.

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Hamico® 8906-WT – Rinse Aid

Hamico® 8906-WT Rinse Aid is a stain preventing additive for rinse systems following hydrochloric or sulfuric acid pickling operations. It is an acidic product possessing corrosion protection and wetting. It is designed to eliminate the brown or reddish stains often experienced on steel exiting a continuous pickler. It eliminates the formation of iron hydroxide slimes which accumulate in rinse tanks as a result of acid bath carryover.

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Sunspeed® PA-7 – Acid Pickling Accelerator

Sunspeed® PA-7 is an acid pickling accelerator containing organic compounds designed to accelerate scale removal from hot rolled steels. It was specifically developed* for use in hydrochloric acid pickling systems. It accelerates the reaction between the hydrochloric acid and scale components; FeO, Fe2O3 and Fe3O4 to increasing the rate of scale removal.

*Developed by Sugimura Chemical Industrial Company, Ltd.

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Pickle Life® 1673-D – Sulfuric Acid Extender

Pickle Life® 1673-D is an additive for extending the useful life of sulfuric acid pickling baths up to 12% iron.