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Inhibitor for ACID
Acid Shield Metal Guard Acid Corrosion Inhibitor is an organic, liquid, cationic corrosion inhibitor especially designed to inhibit the attack of hydrochloric acid on iron and steel during industrial cleaning operations. It also inhibits acid attack on copper and brass. It does not contain arsenic, chlorinated hydrocarbons, or lead compounds.
Premium quality corrosion inhibitor for metals to protect against Hydrochloric Acid, Phosphoric Acid, Sulfuric Acid and other corrosive acids.
RXSO ACIDCORR SHIELD 81 is a high-performance acid corrosion inhibitor formulated for use in hydrochloric acid (HCl) systems, including coiled tubing (CT), acidizing, bullheading, and scale removal operations. The product is a solvent-based blend of surface-active and acid-stable components that protect metal surfaces from acid attack at both low and elevated temperatures.
The addition of Acid Shield Metal Guard Acid Corrosion Inhibitor, inhibitors to hydrochloric acid solution provides maximum protection for equipment during:
Acid Shield Metal Guard Acid Corrosion Inhibitor meet the requirements.
For each 1000 gallons of either 5% or 10% by weight* hydrochloric acid solution, not less than the following amount of Acid Shield Metal Guard Acid Corrosion Inhibitor should be used:
1 Gallon for a cleaning temperature of 150° Fahrenheit.
2 Gallons for a cleaning temperature of 175° Fahrenheit.
3 Gallons for a cleaning temperature of 200° Fahrenheit.
* A 5% by weight Hydrochloric Acid solution contains 14.1% by volume of 20° Be Hydrochloric Acid.
The exceptional strength and heat stability of AAcid Shield Metal Guard Acid Corrosion Inhibitor give the user a considerable safety factor in relation to temperature, acid strength, and time. Acid Shield Metal Guard Acid Corrosion Inhibitor may be added to either the diluted or concentrated hydrochloric acid. In either case, Acid Shield Metal Guard Acid Corrosion Inhibitor should be thoroughly mixed with the acid by stirring or agitation.
The hydrochloric acid solution inhibited with Acid Shield Metal Guard Acid Corrosion Inhibitor is best circulated through the equipment to be cleaned. When circulation cannot be accomplished, the equipment should be filled with the inhibited acid and allowed to react for sufficient time to remove the objectionable deposits. To estimate the proper acid concentration and cleaning time, samples of the deposits to be removed can be tested in the laboratory prior to cleaning. If heating of the equipment to be cleaned or acid solution is desired to speed the cleaning action, it should be done prior to the start of the cleaning operation
Storage and Disposal
Acid Shield Metal Guard Acid Corrosion Inhibitor and will not freeze at temperature as low as -20° Fahrenheit. Below 0° Fahrenheit, Acid Shield Metal Guard Acid Corrosion Inhibitor become very viscous and may be difficult to pump. It is recommended that Acid Shield Metal Guard Acid Corrosion Inhibitor be stored in a dry area where the temperature will not go lower than 0° Fahrenheit.
Applicable regulations concerning disposal and discharge of chemicals should be consulted and followed-
Disposal information for Acid Shield Metal Guard Acid Corrosion Inhibitor is given on the Material Safety Data Sheet for each product.The industrial cleaning bath is acidic and contains hydrochloric acid and organic Acid Shield Metal Guard Acid Corrosion Inhibitor components. Waste treatment , neutralization is required. The industrial cleaning bath and sludge can contain ingredients other than those in the chemical as supplied and analysis of the solution and/or sludge is required before waste treatment and disposal.
Safety and Handling :
Before handling the chemical products used in this process, the first aid and handling recommendations on the Material Safety Data Sheet for should be read, understood and followed. The industrial cleaning bath is strongly acid and can burn skin and eyes. Refer to the Material Safety Data Sheet for hydrochloric acid for recommendations for protective action.
General Guidelines to use Acid Corrosion Inhibitor for Hydrochloric Acid
Rodine 213, Acid Corrosion Inhibitor, RODINE 141, RODINE 145, HydroGel IC 600
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Used to prevent corrosion during acid pumping through coiled tubing strings, which are highly prone to localized corrosion due to high pressure, acid turbulence, and temperature.
Recommended Dosage:
1.0 – 2.0% v/v of total acid volume (e.g., 10–20 L per 1000 L acid)
Recommended Acid Type:
15–28% Hydrochloric Acid (HCl)
Bottomhole Temperature Range:
Effective up to 180°C
Notes:
Blend into acid just before pumping; circulate through CT during pressure buildup.
For protection of casing, tubing, and surface iron when injecting acid to stimulate carbonate or sandstone formations.
Recommended Dosage:
0.5 – 1.5% v/v, depending on:
HCl concentration (higher acid → higher dosage)
Metallurgy (carbon steel vs. 13Cr)
Temperature
Sequence:
Preflush: water or brine
Main flush: HCl + RXSOL ACIDCORR SHIELD 81
Overflush: brine with corrosion inhibitor (optional)
Used in deep well stimulations where temperature can degrade traditional film-forming inhibitors.
Recommended Dosage:
1.5 – 2.0% v/v
Formulation Note:
Add iron control agents and scale inhibitors as needed; verify compatibility.
Protects internal metal surfaces from acid attack during scale or rust removal.
Recommended Dosage:
0.5 – 1.0% v/v in 10–15% HCl
Contact Time:
30–60 minutes recirculation
Note:
Use nonionic surfactant system for better metal wetting and dispersion.
For preserving pipelines, tanks, or tubing during hydrotests that use low-strength acidified water.
Recommended Dosage:
0.25 – 0.5% v/v in low-concentration HCl or brine
Duration:
6–48 hours exposure
Where constant corrosion control is needed in pipelines or injection systems with acid ingress risk.
Recommended Dosage:
10–50 ppm continuous injection
Note:
Suitable for batch or continuous dosing using chemical injection pumps.
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