A Phosphorous-Free Alternative for Corrosion Control

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This paper will present corrosion inhibitor performance data using electrochemical test methods, additional laboratory testing and pilot test results to demonstrate this new inhibitor’s performance benefits, overall effectiveness and value to the water treatment market.

Product Number: 51317--9193-SG

ISBN: 9193 2017 CP

Author: Eric Ward

Publication Date: 2017

Industries: Chemical Inhibitors , Water/Wastewater

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Since the ban of chromates in the 1980s the water treatment industry has extensively relied on phosphate based chemistries as its most widely used corrosion inhibitors for low carbon steel. While these chemistries have frequently proven effective they have always come with the underlying concern of precipitation with soluble calcium in the water causing fouling and loss of inhibitor within the system. To combat these fouling concerns water treatment professionals typically are required to add costlier sulfonated polymers to prevent inhibitor precipitation which drives the overall cost for an effective corrosion inhibitor program higher. Unfortunately precipitation and fouling can still occur either due to product overfeeding or upsets in water chemistry. As water regulations become more stringent the challenge of preventing loss of phosphorous based chemistries to precipitation with calcium is likely to become even more difficult and costly. Furthermore when you factor in the recent regulations on phosphorous based chemistries that are making it more difficult and costly to discharge process water it is clear an alternative to phosphorous based chemistries is desperately needed in the industry. This paper presents a new phosphorous free corrosion inhibitor that eliminates many of the problems and looming regulations associated with phosphorous based inhibitors. This new inhibitor simplifies corrosion control in cooling systems by eradicating the concern of precipitation with calcium. Simultaneously it provides comparable or even better corrosion protection to phosphorous based inhibitors. This inhibitor has the ability to maintain excellent corrosion protection in high calcium containing stressed waters when phosphorous based inhibitors struggle to perform. It performs well in both low and high hardness waters and across a wider pH spectrum than phosphorous inhibitors. It has also shown excellent compatibility with other commonly used corrosion inhibitive chemistries. Furthermore this new inhibitor is made from sustainable sugar feedstocks and is an environmentally friendly alternative to phosphorous based inhibitors. This paper will present corrosion inhibitor performance data using electrochemical test methods additional laboratory testing and field trial results to demonstrate this new inhibitor’s performance benefits overall effectiveness and value to the water treatment market.

Keywords: chromates, phosphates, electrochemical, inhibitors, ater treatment