Magnesium alloy corrosion inhibitor and its preparation method and application

Abstract

The invention discloses a preparation method of a magnesium alloy corrosion inhibitor. The preparation method comprises the following steps that sodium diethyl dithiocarbamate is added into deionizedwater to be uniformly dispersed, then a tobacco stem extract is added for uniform mixing, and then sodium dodecyl benzene sulfonate, sodium acetate, sodium silicate and rosin imidazoline quaternary ammonium salt are added for uniform mixing to obtain the magnesium alloy corrosion inhibitor, wherein the magnesium alloy corrosion inhibitor comprises the following components of, by weight, 20-25wt% of the tobacco stem extract, 10-15wt% of the sodium diethyl dithiocarbamate, 10-15wt% of the sodium dodecyl benzene sulfonate, 5-10wt% of sodium acetate, 5-10wt% of the rosin imidazoline quaternary ammonium salt, 1-5wt% of the sodium silicate and 20-49wt% of the deionized water. The preparation method is simple and does not need energy consumption; and the corrosion inhibitor prepared by using thepreparation method is added into a 2-5wt% sodium chloride solution containing an AZ31B magnesium alloy, then an excellent corrosion inhibition effect is achieved, and the highest corrosion inhibitionrate reaches 97%.

Description

technical field [0001] The invention belongs to the technical field of corrosion inhibition of magnesium alloys in solution, and in particular relates to a magnesium alloy corrosion inhibitor and its preparation method and application. Background technique [0002] The density of magnesium is very small, compared with other practical metals (such as aluminum, iron, etc.), it can meet the requirements of the pursuit of light weight in the manufacturing industry. In recent years, magnesium alloy is the lightest engineering structural material used in the manufacturing industry, which has the advantages of high specific strength / specific stiffness, excellent die casting, weldability and damping resistance. These advantages have attracted a lot of attention in the application fields that require lightweight alloys. Since magnesium alloys can be recycled and reused, they are a kind of green and environmentally friendly lightweight alloys, and they are more and more popular in man...

AI Technical Summary

Problems solved by technology

The standard electrode potential of magnesium is extremely low (-2.37V (vs. SCE)), and its chemical properties are particularly active, which can form oxide film or hydroxide film in different corrosive environments, but the texture of the product film is loose and porous. limited protection

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