ARC-1018 XL Vapour Phase Corrosion Inhibitor

Condensate Treatment

    ARC-1018 XL

    Vapour Phase Corrosion Inhibitor

Condensate Treatment

What causes corrosion in steam condensate systems?

Carbon dioxide and oxygen cause most condensate system corrosion. Carbon dioxide, dissolved in condensed steam, forms corrosive carbonic acid. If oxygen is present with carbon dioxide, the corrosion rate is much higher and is likely to produce localized pitting. Ammonia, in combination with oxygen, attacks copper alloys.

How is steam condensate corrosion prevented?

The general approach involves removing oxygen from the feed water mechanically and chemically and providing pretreatment of the make-up water to minimize potential carbon dioxide formation in the boiler. Chemical treatment reduces corrosion potential further. Volatile amines neutralize carbonic acid formed when carbon dioxide dissolves in condensate. Volatile filming inhibitors form a barrier between the metal and the corrosive condensate.

What is the basis for choosing between neutralizing and filming inhibitors?

The proper choice depends on the boiler system, plant layout, operating conditions and feed water composition. In general, volatile amines are best suited to systems with low make-up, low feed water alkalinity and good oxygen control. Filming inhibitors usually give more economical protection in systems with high make-up, air in-leakage, high feed water alkalinity or intermittent operation. In most cases, a combination of these treatments may be the best to combat condensate corrosion

What characteristics should a good condensate corrosion inhibitor have?

A good volatile neutralizing amine should have a favorable distribution ratio in steam and condensate so that it protects the entire steam-condensate system. It should have no insoluble reaction products and should be stable at high temperatures and pressures. A good filming inhibitor should be easy to disperse in water. It should be stable under usage conditions and form a thin, protective film without causing deposits in either the boiler or steam-condensate system

Our Product – ARC-1018 XL


ARC-1018 XL is a dual neutralizing amine steam and condensate line corrosion inhibitor. It is a long-carrying amine system designed specifically for protection of extensive steam and condensate piping systems. It can be used in any type of steam boiler system.


ARC-1018 XL is a dual amine system which is highly effective in its ability to neutralize corrosive carbonic acid formed in the after boiler piping systems.

ARC-1018 XL can be used in all types of steam boilers, with any materials of construction in the steam and condensate return line systems, and heat exchangers. It is efficient at preventing low pH corrosion, or if corrosion has already occured, promotes removal of corrosion byproducts.


  • Inhibits steam-condensate corrosion caused by carbon dioxide and/or dissolved oxygen. Suited for complex steam systems, which include medium to long and/or branched steam systems as well as very short runs including boiler-room machinery. It will afford protection to all stages of a multi-stage turbine.
  • Inhibits corrosion in vapor-phase processes such as certain refinery processes and in some waste oil recovery operations.
  • Provides corrosion protection where chloride, sulfide, sulfate, carbon dioxide, and organic acids are present.
  • Provides corrosion protection to cold-end equipment in the flue gas systems of gas-fired boilers and furnaces. Carbonic acid and sulfuric acid corrosion can be severe in such equipment, especially in very high efficiency installations, which operate at or near condensation conditions.


When used to protect a steam system, ARC-1018 XL may be added separately to the deaerator storage section, feed water tank, feed water line, or directly to the boiler with other boiler treatment chemicals.

When used to protect equipment in a vapor-phase process, or in a flue gas system, ARC-1018 XL should be injected continuously into the gas stream and/or the wash water (if used).