Patent ID: 9714182
Date: 2017-07-25
CPC Classifications: C02F,C09K,C23F,F24D,F28F

Claim:
1. A phosphorus-free corrosion and scale inhibitor used in circulating cooling water of central air conditioning, comprising tourmaline, green corrosion and scale inhibitor and zinc salt, wherein the green corrosion and scale inhibitor is at least one of: polyaspartic acid, polyepoxysuccinic acid, polymaleic acid, and a combination thereof, further wherein a content of the tourmaline is 5-500 grams per metric ton (g/t) calculated based on solid form, a content of the green corrosion and scale inhibitor is [5-50 g/t] 5-50 grams per metric ton (g/t) calculated based on liquid form, and a content of the zinc salt is [0.2-0.8 g/t] 0.2-0.8 grams per metric ton (g/t) calculated based on solid form.