Cooling Water Corrosion Control

ASI is pleased to announce the effectiveness of AS-8150 for industrial cooling water applications. The efficacy of AS-8150 was compared to orthophosphate by Puckorius and Associates of Evergreen, CO. The results of this test were very positive.

AS-8150 is the first truly new corrosion inhibitor in many years. Our theory is the stannous form of tin forms temporary bonds with metals undergoing corrosion and shares electrons, thereby stopping the corrosion process. It functions differently than most of the products presently used because it does not react with calcium and form a “protective film” as a means of stopping the corrosion process. This form of treatment reduces the potential for fouling, and we anticipate being able to provide an increase in cooling capacity as well.

Microbiologically Induced Corrosion (MIC) can be significantly reduced by replacing a phosphate based corrosion inhibitor with AS-8150, which is inorganic and contains no nutrients.

In the mid eighties, chromate was outlawed, and it became more difficult to get desired results using phosphate-based corrosion inhibitors. One of the reasons is phosphates must react with calcium to form an insoluble precipitant, calcium phosphate, which lays down a protective layer. Controlling the layer is tricky; too little and corrosion is unchecked, too much and heat transfer is reduced.

AS-8150 is more forgiving since it does not react to form an insoluble precipitant.
Heat transfer rates cannot be adversely affected.
Equilibrium corrosion rates are much lower than with orthophosphate.
Corrosion on AS-8150 inhibited coupons compares overall to localized corrosion using orthophosphates.
AS-8150 is non-nutritive while orthophosphate is a nutrient for bacteria which can result in Microbiologically Induced Corrosion (MIC).
AS-8150 will work very well in both closed and open recirculating systems.
AS-8150 is tin-based. Tin is not found on NEPDES permits.

AS Inc. offers fully formulated products incorporating tin as the carbon steel corrosion inhibitor, such as AS-8310. This product incorporates phosphonate polymer for deposit control and tolytriazole for yellow metal corrosion protection. We also offer formulations with alternative scale control and yellow metal inhibitors. These formulations can be blended phosphate free if desired.

Cooling Water Applications