Composite acid metal surface cleaning agent and using method thereof

Abstract

The invention discloses a composite acid metal surface cleaning agent and a using method thereof. The composite acid metal surface cleaning agent comprises 1% of corrosion-inhibiting component and 30%-50% of scale-removing components in mass percentage, wherein the corrosion-inhibiting component comprises 30-70 parts by weight of hexamethylene tetramine, 10-50 parts by weight of o-xylene thiourea, 10-50 parts by weight of sodium alkyl benzene sulfonate, 1-10 parts by weight of sodium erythorbate and 1-5 parts by weight of methyl benzotriazole; and the scale-removing components comprise 65-92 parts by weight of sulfamic acid, 3-30 parts by weight of citric acid and 0.1-5 parts by weight of ammonium bifluoride. The composite acid metal surface cleaning agent has the advantages of strong cleaning capacity, low cleaning temperature, no water-soluble volatility without acid mist generation, easy enforcement of cleaning engineering, low cleaning expense and the like and can be widely suitable for cleaning various large-scale boilers or heat exchangers.

Description

technical field [0001] The invention relates to a cleaning agent for metal surface cleaning, which is especially suitable for cleaning the surface of large-scale boiler or heat exchanger metal composed of various materials such as carbon steel, stainless steel, alloy steel, copper and copper alloy. Background technique [0002] Chemical cleaning of boilers in power plants plays an extremely important role in the safe and economical operation of power plants. With the increasing capacity of generating units, the capacity of boilers is getting higher and higher, and there are more and more types of heating surface materials, and the requirements for water vapor quality in boiler operation are also increasing. getting stricter. The quality of boiler cleaning directly affects the quality of water vapor and the safe and economical operation of the boiler. Therefore, higher and higher requirements are put forward for boiler cleaning. At present, the commonly used cleaning agents ...

AI Technical Summary

Problems solved by technology

These cleaning agents have certain defects. Although hydrochloric acid cleaning has strong cleaning ability and low drug cost, it has a small range of applicable materials and cannot be used for cleaning stainless steel and alloy steel. The corrosion rate is up to 6g / m 2 Disadvantages above h

Although citric acid and EDTA cleaning are applicable to a wide range of materials, they are limited by the type of scale, poor cleaning ability, high cleaning temperature requirements (citric acid 90-95°C, EDTA 130-140°C), difficult process implementation, high drug costs, waste liquid Disadvantages such as difficult to deal with