Low phosphine compound slow corrosion antisludging agent

Abstract

The present invention relates to a kind of low phosphine corrosion and scale inhibitor suitable for carbon steel material in corrosive water. The low phosphine corrosion and scale inhibitor contains: 2-phosphonic butane-1, 2, 4-tricarboxylic acid 10-15wt%, phosphono carboxylic acid copolymer 5-15wt%, zinc vitriol 5-15wt%, polyepoxy succinic acid 10-20 wt%, and other dispersant 2.5-30 wt%. For common medium and low hardness corrosive water and when the concentration multiple is 3-6 and added low phosphine corrosion and scale inhibitor amount is 70-90 mg/L, there are carbon steel corroding rate less than 0.075mm/a, scale inhibiting rate higher than 95%, and exhausted water reaching relevant standard.

Description

a technical field [0001] The invention relates to a corrosion and scale inhibitor for industrial circulating cooling water, in particular to a low-phosphine composite corrosion and scale inhibitor suitable for corrosive water and carbon steel materials. Two background technology [0002] In the circulating water system with high hardness and high alkalinity water quality, because the scaling problem is very prominent, people focus on the scale prevention problem. At this time, the corrosion problem of carbon steel is often seldom considered or even not considered. The main component is antiscalant and dispersant, and organic phosphine compound is not an essential component in this kind of agent. In the treatment of circulating water in the power system, since people only care about the corrosion and scale inhibition of copper pipes (or stainless steel pipes) of the condenser, the corrosion of carbon steel pipes that have been treated with rubber-lined protection is not consi...

AI Technical Summary

Problems solved by technology

Chinese patent application 01113457.7 provides a corrosion and scale inhibitor with polyaspartic acid, sodium tungstate, sodium citrate, zinc salt, etc. as the main components. Due to the high price of sodium tungstate, it is actually difficult to promote; Chinese patent application 03137272.4 discloses a phosphorus-free corrosion and scale inhibitor mainly composed of sodium gluconate, zinc salt, (sulfamic acid + polyaspartic acid + organic base + maleic anhydride) reaction product, the main component is not clear , when applied to carbon steel materi