51313-02760-Comparative Study of Commercially Available Propargyl Alcohol-Free Corr. Inh. for HCl Acid Systems

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Product Number: 51313-02760-SG

ISBN: 02760 2013 CP

Author: Roxanne Shank

Publication Date: 2013

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Corrosion Inhibition is of the utmost concern to chemists involved in the research and development of novel chemical cleaning solutions for industrial purposes. Acid corrosion inhibitors for example are an absolute necessity when it comes to the chemical cleaning of heat exchangers and boilers made from materials such as stainless steels and copper alloys. In many instances scales and deposits must be treated with strong acids which are often highly corrosive to the base metals present in the equipment. Corrosion rates can be reduced to reasonable levels upon the addition of acid corrosion inhibitors. Hydrochloric acid (HCl) is commonly employed to dissolve a variety of scales; however inhibitors which are used to protect the metals from corrosion by HCl often contain a number of highly toxic compounds including quaternary amines nonyl- and octylphenol ethoxylates propargyl alcohol formaldehyde mercury and arsenic. Propargyl alcohol is of major concern as not only is it several orders of magnitude more toxic than methanol but it is also very corrosive to the lungs and skin. Propargyl alcohol is also described as a nerve toxin which directly attacks the Central Nervous System. Combined with the rather low dermal toxicity propargyl alcohol can easily become fatal in relatively small amounts. Environmental and safety concerns demand the replacement of propargyl alcohol in chemical cleaning blends. Several nontoxic compounds currently available on the market have made claims towards their ability to provide corrosion inhibition towards HCl-based systems comparable to that observed for propargyl alcohol; however the data provided is qualitative at best. In this study measurements of the corrosion rate of HCl on carbon steel in the presence of various acid corrosion inhibitors are presented. Furthermore toxicological and economical data are included to provide a detailed investigation into suitable replacements for propargyl alcohol based corrosion inhibitors.