The invention discloses a composite scale and
corrosion inhibitor. The inhibitor is characterized by comprising the following main ingredients: 2-phosphono-1,2,4-
tricarboxylic acid, hydroxyethylidene-1,1-diphosphonic acid, an acrylic
copolymer,
benzotriazole,
zinc chloride, polyepoxysuccinic acid and deionized water. The inhibitor disclosed by the invention has the following beneficial effects that 2-phosphono-1,2,4-
tricarboxylic acid, the hydroxyethylidene-1,1-diphosphonic acid, the acrylic
copolymer,
benzotriazole,
zinc chloride and the polyepoxysuccinic acid of the inhibitor all have good scale and
corrosion resistance; and after the above ingredients are compounded according to the weight parts in the formulation of the inhibitor disclosed by the invention, the scale and
corrosion resistance effect of the inhibitor is obviously enhanced. The inhibitor disclosed by the invention is suitable for high
hardness and high base, and has extremely strong complexing function on
carbonate scale. The composite sale and
corrosion inhibitor is good in scale and corrosion resistance, low in
phosphorus content, and therefore is capable of meeting environment protection requirements. The inhibitor disclosed by the invention not only is suitable for circulating cooling water in a
natural gas purification treatment
plant, but also is suitable for circuiting cooling water systems in other industries of chemical
fertilizer, power,
textile and the like, as well as is wide in application range; and acid does not need to be added for regulating PH (Potential of
Hydrogen) value.