A Schiff base nickel complex and its application as a pickling corrosion inhibitor for metal materials

A technology of Schiff base nickel and metal materials, applied in the direction of nickel organic compounds, etc., to achieve the effect of good corrosion inhibition efficiency, expanded application range, and low dosage

Inactive Publication Date: 2016-02-17
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the corrosion inhibition effect of Schiff base metal complexes on metal materials is rarely reported.

Method used

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  • A Schiff base nickel complex and its application as a pickling corrosion inhibitor for metal materials
  • A Schiff base nickel complex and its application as a pickling corrosion inhibitor for metal materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Stir and dissolve 0.1g of pyridoxal hydrochloride, 0.087g of anhydrous sulfanilic acid and 0.056g of potassium hydroxide in a mixed solvent of 10mL of methanol and 5mL of distilled water, then add 0.12g of nickel chloride hexahydrate and 5mL of distilled water at 50oC After condensing and reflux stirring for 2 hours, the reaction was stopped. After the reaction solution was cooled to room temperature, the liquid was filtered and allowed to stand for 2 days, and then crystals were precipitated. After filtration, the crystals were washed with methanol and dried to obtain a brownish-black crystal, which was the product. The product was characterized by infrared spectroscopy and single crystal X-ray diffraction to determine its crystal structure.

Embodiment 2

[0022] 0.1g of pyridoxal hydrochloride, 0.078g of anhydrous sulfanilic acid and 0.05g of potassium hydroxide were stirred and dissolved in a mixed solvent of 10mL of methanol and 5mL of distilled water, and then 0.058g of nickel nitrate hexahydrate and 5mL of distilled water were added. After stirring for 6 hours, the stirring was stopped, and the liquid was filtered and allowed to stand for three days before crystallization occurred. After filtration, the crystals were washed with methanol and dried to obtain a brownish-black crystal, which was the product. Product proves that it is the same product as Example 1 through infrared spectrum characterization.

Embodiment 3

[0024] 1.02g of pyridoxal hydrochloride, 0.95g of anhydrous sulfanilic acid and 0.63g of potassium hydroxide were stirred and dissolved in a mixed solvent of 50mL of methanol and 25mL of distilled water, then 1.57g of nickel sulfate hexahydrate and 25mL of distilled water were added, and the After stirring for 10 h, the stirring was stopped, and the liquid was filtered and allowed to stand for three days before crystallization occurred. After filtration, the crystals were washed with methanol and dried to obtain a brownish-black crystal, which was the product. Product proves that it is the same product as Example 1 through infrared spectrum characterization.

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Abstract

The invention discloses a Schiff base nickel complex and an application thereof as a corrosion inhibitor in the acid-pickling process of a metal material. The Schiff base nickel complex is prepared by dissolving pyridoxal hydrochloride, sulfanilic acid, potassium hydroxide and water-soluble nickel salt in the mixed solvent of methanol and water; the Schiff base nickel complex can prevent a metal material from being corroded by an acid liquid in the acid-pickling process and can prevent the unnecessary consumption of the acid liquid. In the acid-pickling liquid with hydrochloric acid concentration of 1.0mol / L, when the concentration of Schiff base nickel complex is 0.4g / L to 0.8g / L, a remarkable corrosion inhibiting effect on the steel material and copper material can be realized. The Schiff base nickel complex is simple to prepare, and raw materials are cheap and easy to obtain; when being used as the corrosion inhibitor, the Schiff base nickel complex has the advantages of simple application method, low consumption and strong corrosion-inhibiting lasting capacity.

Description

technical field [0001] The invention relates to a Schiff base nickel complex and its application as a corrosion inhibitor in the pickling process of metal materials. Background technique [0002] Schiff base (Schiffbase) refers to a class of organic compounds containing imine groups (-HC=N-) or methyl imine groups (-RC=N-). The N atom in the core part of the Schiff base has a lone pair of electrons and has a strong coordination ability. Various functional groups can be introduced on both sides of the C=N double bond in the Schiff base to derivatize it. The synthesis is relatively easy, and various aldehydes or ketones with carbonyl groups can be flexibly selected for reaction. By changing the connected substituents and changing the atomic nature and position of the electron donor, many Schiff base ligands with different properties and variable structures can be developed from chain to ring, from monodentate to multidentate, and Then a variety of complexes are synthesized, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F15/04C23G1/06
Inventor 曾巨澜甘娟肖忠良刘振强张雄飞曹忠
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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