Surface modification for Al alloy by volatile corrosion inhibitors from cyclohexylamine, octanoic acid, and their reaction product

Ma, Tengfei; Zhang, Hongliang; Gao, Lixin; Zhang, Daquan; Yan-liang, Zhao; Sun, Min; Dai, Yigang

doi:10.1002/maco.202112317

Cited by 3 publications

(1 citation statement)

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“…Vapor-phase protection of metals usually implies the use of volatile inhibitors. However, the so-called “chamber” protection is being intensely developed at present [ 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 ]. It involves a short-term surface treatment with vapors of an organic inhibitor at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

Structuring of Surface Films Formed on Magnesium in Hot Chlorobenzotriazole Vapors

Goncharova

Luchkin²,

Senchikhin³

et al. 2022

Materials

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Chamberprotection of metals from atmospheric corrosion is a variety of vapor-phase inhibition. It is based on the effect of adsorption films formed in the vapors of low-volatile corrosion inhibitors at elevated temperatures. The paper analyzes the specific features of the chamber protection of a magnesium alloy with chlorobenzotriazole. It has been found that the protective properties of surface films formed in hot vapors of this compound increase upon exposure of the metal to air. The processes of structuring of protective films that occur in this case have been studied by a set of corrosion, electrochemical and physical methods. It has been shown that chamber treatment of the alloy is accompanied by chlorobenzotriazole adsorption and uniform thickening of the surface oxide-hydroxide layer. In this case, the corrosion processes slow down by a factor of up to 10. Prolonged exposure of the samples in air after the chamber treatment results in additional oxidation of magnesium and hydroxylation of the oxide. However, the oxide-hydroxide layer does not grow on the entire surface, but as separate islets. Such a change in the structure of the surface films results in an additional 10-fold increase in the corrosion resistance of the magnesium alloy.

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