High-efficiency solid pickling inhibitor for many metals

A technology of corrosion inhibitor and solid acid, applied in the field of high-efficiency solid acid pickling corrosion inhibitor for various metals, can solve the problems of high dosage and large difference in effect, and achieve the effect of less dosage, convenient carrying and good corrosion inhibition effect.

Inactive Publication Date: 2009-12-23
KESHENG ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, although there are a wide variety of corrosion inhibitors commonly used at present,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1, the pickling liquid is dilute sulfuric acid, and concentration is 5%, and the pickling liquid consumption is 1000kg, adds 100ppm corrosion inhibitor namely 100g corrosion inhibitor, in 100g corrosion inhibitor consists of 60g Tianjin Ruoding, 10g Tianjin Ruoding, 10g of thiourea, 10g of benzotriazole and 10g of sodium dodecylbenzenecyclonate are used as a solid corrosion inhibitor. Submerge the cleaned steel, stainless steel, copper, and aluminum in the pickling liquid at room temperature. At the same time, the agitator was started, and the highest corrosion inhibition rate of carbon steel was found to be 98% through experimental testing.

[0012] The corrosion inhibition rate of stainless steel is 99%, that of copper is 99%, and that of aluminum is 95%. It is an efficient multi-metal solid corrosion inhibitor. After 4 hours, add 50ppm to maintain the above corrosion rate for 4 hours .

Embodiment 2

[0013] Embodiment 2, the pickling liquid is dilute HCl, and concentration is 3%, and the pickling liquid consumption is 1000kg, adds 100ppm corrosion inhibitor namely 100g corrosion inhibitor, in 100g corrosion inhibitor consists of 60g Tianjin Ruoding, 10g Tianjin Ruoding, 10g of thiourea, 10g of benzotriazole and 10g of sodium dodecylbenzenecyclonate are used as a solid corrosion inhibitor. Submerge the cleaned steel, stainless steel, copper, and aluminum in the pickling liquid at room temperature. At the same time, the agitator was started, and the highest corrosion inhibition rate of carbon steel was found to be 98% through experimental testing.

[0014] The corrosion inhibition rate of stainless steel is 99.5%, that of copper is 99.6%, and that of aluminum is 95.8%. It is an efficient multi-metal solid corrosion inhibitor. After 4 hours, add 50ppm to maintain the above corrosion rate for 4 hours .

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Abstract

The invention belongs to the technical field of fine chemistry industry, and in particular relates to a high-efficiency solid pickling inhibitor for many kinds of metal of the field of industrial cleaning. The inhibitor is prepared from the following components by weight percent through crushing and mixing: 50 to 80% of rodine, 10 to 20% of hexamethylenetetramine, 10 to 20% of thiocarbamide, 5 to 10% of benzene azimide and 1 to 5% of surfactant. The invention has the advantages of synergistic effect, low use level and portability, and is suitable for many metals or alloys, including carbon steel, stainless steel, copper, zinc, aluminum, titanium and the like, thereby having high practical value.

Description

Technical field: [0001] The invention belongs to the technical field of fine chemicals, and in particular relates to a variety of metal high-efficiency solid pickling corrosion inhibitors in the field of industrial cleaning. Background technique: [0002] Pickling corrosion inhibitors are widely used in the chemical cleaning process of industrial equipment, boilers, heat exchangers, metal pickling and derusting and acidizing oil recovery and other processes. Commonly used acids for pickling include organic acids, citric acid, sulfamic acid, etc. and inorganic acids: hydrochloric acid, sulfuric acid, phosphoric acid, hydrofluoric acid, etc. These acids have a corrosive effect on metal equipment during the cleaning process, especially the corrosion of inorganic acids is more serious. [0003] The research on pickling corrosion inhibitors in my country began in the 1950s, and from the mid-1970s to the end of the 1980s, pickling corrosion inhibitors in my country developed rapi...

Claims

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Application Information

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IPC IPC(8): C23G1/06
Inventor 曹惠忠
Owner KESHENG ENVIRONMENTAL PROTECTION TECH CO LTD
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