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Compound corrosion inhibitor of Mg-Al series alloy and preparation method and application of compound corrosion inhibitor

A corrosion inhibitor, mg-al technology, applied in the field of corrosion inhibition of magnesium alloys in corrosive environments, can solve problems such as low cost, and achieve the effects of low cost, good synergy and good environmental friendliness

Active Publication Date: 2021-09-28
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In order to solve the problem of the synergistic effect between the corrosion inhibitors of the prior art and the stability of the corrosion inhibition efficiency, the purpose of the present invention is to overcome the deficiencies in the prior art and provide a composite corrosion inhibitor of Mg-Al alloys and Its preparation method and application are only composed of two kinds of corrosion inhibitors, and the corrosion inhibition efficiency is not less than 95%. The corrosion inhibition efficiency of the composite corrosion inhibitor of Mg-Al alloy is stable and high, the cost is low, and it is easy to realize

Method used

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  • Compound corrosion inhibitor of Mg-Al series alloy and preparation method and application of compound corrosion inhibitor
  • Compound corrosion inhibitor of Mg-Al series alloy and preparation method and application of compound corrosion inhibitor
  • Compound corrosion inhibitor of Mg-Al series alloy and preparation method and application of compound corrosion inhibitor

Examples

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Effect test

Embodiment 1

[0039] A method for preparing a composite corrosion inhibitor for Mg-Al alloys. The ratio of the concentration of sodium phosphate to sodium lauryl sulfate is 2:1, and the temperature is set to 35°C and the rotation speed is set to Under the magnetic stirring condition of 600r / min, first sodium phosphate is added in the 3.5wt% sodium chloride solution, after completely dissolving, add sodium lauryl sulfate again in 5 times, can obtain the sodium phosphate concentration is 10mmol / L, sodium lauryl sulfate concentration is 5mmol / L compound corrosion inhibitor in 3.5wt% sodium chloride solution, referred to as compound corrosion inhibitor for short.

[0040] Named as compound corrosion inhibitor.

[0041] In order to prove the effect of the composite corrosion inhibitor, a immersion test was carried out. The specific immersion method was to soak the blank sample of the AZ91D magnesium alloy in the obtained composite corrosion inhibitor for 24 hours. Test results such as figure ...

Embodiment 2

[0074] A method for preparing a composite corrosion inhibitor of a Mg-Al alloy with a corrosion inhibitor ratio of 1:2, the steps not specified in particular are the same as in Example 1, the difference is that: sodium lauryl sulfate The concentration is 20mmol / L, and the sample to be tested is AZ31B magnesium alloy.

Embodiment 3

[0076] A method for preparing a composite corrosion inhibitor of a Mg-Al alloy with a corrosion inhibitor ratio of 1:1, the steps not particularly specified are the same as in Example 1, the difference is that the sodium lauryl sulfate The concentration is 10mmol / L, and the sample to be tested is AM60B magnesium alloy.

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Abstract

The invention discloses a compound corrosion inhibitor of a Mg-Al series alloy and a preparation method and application of the compound corrosion inhibitor. The compound corrosion inhibitor is prepared by compounding an inorganic corrosion inhibitor sodium phosphate and an organic corrosion inhibitor lauryl sodium sulfate; and the ratio of the amount of substance of the sodium phosphate to the amount of substance of the lauryl sodium sulfate is 2: (1-4). The preparation method comprises the following steps that sodium phosphate is added into water, and after the sodium phosphate is completely dissolved, the lauryl sodium sulfate is added to obtain corrosion inhibition liquid of the compound corrosion inhibitor containing the Mg-Al alloy. When the corrosion inhibitor is used as an Mg-Al alloy corrosion inhibitor and the corrosion inhibitor is added into a sodium chloride solution with the mass fraction of 3-5wt%, the corrosion inhibition efficiency can reach 95% or above after the corrosion inhibitor is soaked for 1 hour; and the corrosion inhibition efficiency after being soaked for 48 hours can reach 99% or above. The corrosion inhibitor has the advantages of being high in corrosion inhibition efficiency, long-time in corrosion inhibition effect, simple in components, good in corrosion inhibition efficiency stability, environment-friendly and good in water solubility. Therefore, the application requirement and the standardized production requirement are met, and the obvious economic value is achieved.

Description

technical field [0001] The invention belongs to the technical field of corrosion inhibition of magnesium alloys in corrosive environments, and in particular relates to a composite corrosion inhibitor for Mg-Al alloys and a preparation method and application thereof. Background technique [0002] Magnesium alloy has the advantages of light weight, good thermal conductivity, strong electromagnetic shielding ability, and easy cutting and processing. It has been widely used in automobiles, aerospace and other fields. However, active chemical properties and poor corrosion resistance of magnesium alloys have become important factors restricting its development. Therefore, how to effectively improve the corrosion resistance of magnesium alloys is one of the current research hotspots. [0003] A corrosion inhibitor is a chemical substance that can effectively prevent or slow down the corrosion of target metals in environmental media at low concentrations, also known as corrosion inh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/08
CPCC23F11/08
Inventor 李谦王哲旭
Owner SHANGHAI UNIV
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