TECHNOLOGIES FOR CHEMICAL MILLING OF ALUMINIUM AND ITS ALLOYS: THE USE OF ALKALINE AGENTS
Анотація
The problem of improving the efficiency of chemical milling technologies while simplifying the procedure for their implementation remains unresolved. One of the efficient ways to solve this problem is to develop new etching compounds. The purpose of this work was to experimentally determine the optimal conditions for the use of salt additives (NaNO3, NaClO4) as components of alkaline solutions in chemical milling technologies, as well as to develop the foundations for the rational use of waste in these technologies. It is shown that the introduction of a salt additive to an alkaline solution of chemical milling increases the rate of aluminium removal. In this case, the quality of the treated surface is improved, and the amount of evolved hydrogen decreases. The optimal chemical composition of the etching solution is proposed. It is shown that the spent aluminate solutions can be used to obtain the basic aluminium salt A12(OH)5C1, which has a high coagulating ability. It has been determined that aluminium hydroxychloride can be used as a precipitating reagent for the decomposition of alkali-aluminate solutions. The scheme of the chemical milling process has been proposed. It provides for the regeneration of the components of the etching alkaline solution and contributes to the rational use of technological resources
Key words: chemical milling, aluminium and its alloys, alkaline solution, salt additive, dissolution speed.
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https://doi.org/10.35546/kntu2078-4481.2020.3.6
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