Calcium Chloride Refrigeration Brine Systems
Traditionally refrigeration brine systems have been inhibited against corrosion with Sodium Chromate based chemistry. Over the past 20 years (or so) Chromates have been recognized as proven carcinogens and their continued use has either been “outlawed” or discouraged. Most water treatment providers including Hood Chemical discontinued the use of chromates years ago and unfortunately this has left a void in protection technology. Hood Chemical has developed a very viable phosphonate based formula (WM 8699) to fill this void. Studies were run using a corrosion coupon test rack recirculating a 20% Calcium Chloride brine solution. WM 8699 was added at a level of 3000 ppm. Corrosion rates averaging
Static corrosion tests were also run to compare our WM 8699 to a competitive product (composition unknown) and over a 145-day period, we achieved corrosion rates of
WM 8699 will be consumed in protecting the system (film formation) particularly on initiation of the program. Regulate testing using a modified phosphonate test procedure is recommended.
Parts Per Million (PPM), How Small is it?
Parts per million or billion” is a phrase used in the measurement of chemicals or other substances permitted in minute amounts in foods. To make the comparison more understandable, the American Spice Trade Association has given a different perspective: One part per million is the equivalent of one facial tissue in a stack higher than the Empire State Building, or one pancake in a pile four miles high. One part per billion is the equivalent to one sheet of toilet paper in a roll stretching from New York to London, or one second in 32 years.
Please contact your Hood Chemical representative for further information.