N-heterocyclic carbon steel pickling corrosion inhibitor and application thereof
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A technology of pickling corrosion inhibitor and nitrogen heterocyclic ring, which is applied in the field of steel pickling corrosion inhibitor, can solve the problems of poor environmental friendliness, toxic and side effects, etc., achieve excessive corrosion inhibition, strong continuous action ability, and cheap and easy-to-obtain raw materials Effect
Inactive Publication Date: 2009-10-14
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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[0004] Currently commonly used corrosion inhibitors mainly include inorganic compounds such as chromate, nitrate, and nitrite. D
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[0019] Example 1
[0020] The pickling liquid is dilute hydrochloric acid, the concentration is 0.5M, the amount of the pickling liquid is 100L, and 1-phenyl-2-{5-(1,2,4-triazole)-1methyl-(1,3, 35g of 4-oxadiazole)-2-sulfur}-ethanone, the steel to be cleaned was immersed in the pickling solution for 3h at room temperature.
[0021] The highest corrosion inhibition efficiency obtained through experimental testing is 95%, which shows that it is an efficient corrosion inhibitor.
Example Embodiment
[0022] Example 2
[0023] The pickling liquid is dilute hydrochloric acid, the concentration is 0.5M, the amount of the pickling liquid is 100L, and 2-(4-tert-butyl-benzylsulfur)-5-(1,2,4-triazole)-methyl is added -(1,3,4-oxadiazole)20g, 1-(4-fluorobenzene)-3-{4-(1,2,4-triazole-1-methoxy)-benzene}- Propylene 20g, the steel to be cleaned is immersed in the pickling solution for 3h at room temperature.
[0024] The highest corrosion inhibition efficiency obtained through experimental testing is 96%, which shows that it is an efficient corrosion inhibitor.
Example Embodiment
[0025] Example 3
[0026] The pickling liquid is dilute hydrochloric acid, the concentration is 1M, the amount of the pickling liquid is 100L, and 1-(4-fluorobenzene)-3-{4-(1,2,4-triazole-1-methoxy) -Benzene}-propylene 35g, immerse the steel to be cleaned in the pickling solution for 3h at room temperature.
[0027] The highest corrosion inhibition efficiency obtained through experimental testing is 93%, which shows that it is an efficient corrosion inhibitor.
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Abstract
The invention relates to a steel pickling corrosion inhibitor, in particular to an N-heterocyclic carbon steel pickling corrosion inhibitor for avoiding unnecessary corrosion and acid liquor consumption in the pickling process of carbon steel as well as produced products and an application thereof. The corrosion inhibitor is a triazole or oxadiazole heterocyclic compound or the combination thereof and is submerged with cleaning liquid added with the corrosion inhibitor for washing the carbon steel; and the cleaning liquid is pickling liquor with the concentration of 0.1mol/L-1mol/L, and each liter of acid liquor is added with 0.00-2.0g of corrosion inhibitor and submerged for 0.5-4 h. The corrosion inhibitor includes the triazole heterocyclic compound which has the characteristics of no poison, innocuity, easy synthesis and low price and easily obtained raw materials; and the corrosion inhibitor is adopted for cleaning the carbon steel and the surfaces of the products thereof and can avoid the excessive corrosion of the matrix metal and the excessive consumption of the acid liquor in the pickling process and has the advantages of low consumption and efficiency and continuous capability.
Description
technical field [0001] The invention relates to steel pickling corrosion inhibitors, specifically a nitrogen-heterocyclic high-efficiency carbon steel acid used to prevent acid corrosion of carbon steel materials and excessive consumption of acid solution in the pickling process of carbon steel and its products Corrosion inhibitors and their applications. Background technique [0002] Strong acid cleaning of surface rust and dirt is an important cleaning method for surface pretreatment of metal materials, cleaning and descaling of pipes and boiler systems. Because pickling is of great significance to maintain the normal operation of equipment, it is still widely used in metal materials, machinery, metallurgy, chemical industry and other industries. [0003] The most commonly used acids for pickling are hydrochloric acid, sulfuric acid, citric acid, etc., but because strong acids have a corrosive effect on metal equipment, the phenomenon of "over-corrosion" often occurs duri...
Claims
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