Metal surface cleaning anti-scaling agent containing compound acid

Abstract

The invention belongs to the technical field of chemical cleaning of metal surfaces, and particularly relates to a metal surface cleaning anti-scaling agent containing compound acid. The agent comprises two or more components in parts by weight as follows: 70-98 parts of sulfamic acid, 0.05-20 parts of glycolic acid, 0.05-20 parts of tartaric acid, 0.05-20 parts of lactic acid, 0.05-20 parts of gluconic acid, 0.05-20 parts of salicylic acid, 1.5-1.8 parts of a sulfamic acid corrosion inhibitor and 0.2-0.45 part of a surfactant. The agent utilizes sulfamic acid as the main pickling potion, the material status is solid, therefore the transportation is convenient, the cost is low, the pickling temperature is low, the implementation is facilitated, and time, labor and energy are saved. During water washing after pickling, the temperature difference born by a water wall can be reduced greatly under the condition of insufficient heat source capacity, and the protection of the water wall is facilitated. The agent is further provided with characteristics of simple postprocessing, low cleaning cost, and the like, can be applied to chemical surface cleaning of various metal materials such as carbon steel, stainless steel, alloy steel and the like, and can be widely applied to chemical cleaning of various large-capacity boilers and heat exchangers.

Description

technical field [0001] The invention belongs to the technical field of metal surface chemical cleaning, in particular to a compound acid metal surface cleaning and descaling agent. It is suitable for surface cleaning of large boilers or heat exchangers made of various materials such as carbon steel, stainless steel, alloy steel, copper and copper alloys. Background technique [0002] Chemical cleaning agents for metal surfaces mainly include inorganic acids and organic acids. Commonly used are hydrochloric acid, citric acid, EDTA, glycolic acid, formic acid, etc. These agents have certain shortcomings in current use, such as hydrochloric acid cannot be used for austenitic steel and stainless steel, although citric acid and EDTA have a wide range of applications, but the use temperature is relatively high (citric acid 90-95 ° C, EDTA120-140 ℃), which has the disadvantages of high heat source requirements and long heating time during the implementation process, especially in ...

AI Technical Summary

Problems solved by technology

These agents have certain shortcomings in current use, such as hydrochloric acid cannot be used for austenitic steel and stainless steel, although citric acid and EDTA have a wide range of applications, but the use temperature is relatively high (citric acid 90-95 ° C, EDTA120-140 ℃), which has the disadvantages of high heat source requirements and long heating time during the implementation process, especially in winter for newly-built units put into operation, the temperature rise is the biggest restrictive factor

Moreover, the treatment of these two organic acid waste liquids is difficult. Generally, they have to be transferred to coal yards or ash yards or adopt biochemical treatment methods. Conventional chemical treatment methods at room temperature cannot achieve discharge standards.