Trichloroethylamide Derivatives as a Novel Type of Brightening Agent in the Electrochemical Deposition of Nickel Coatings
Year: 2018
Type: article
Abstract: In this paper, we discuss the effect of adding trichloroethylamides of certain sulphonic and car-boxylic acids on the formation of bright coatings in electrochemical nickel plating using the standard Watts electrolyte. As a result, three out of the four compounds under study formed bright coatings, with one forming a semi-bright coating. The additives were introduced into the electro-lyte in an amount of 0.1-0.7 g / L. The current output was 78-97%. The porosity of the coatings obtained reached 0.28-11.02 pores/cm2, which is significantly lower than that obtained with other brighteners. The best brightness-forming effect among the additives studied was achieved with 1-hydroxy-2,2,2-trichloroethylamide of acetic acid and 1-4-methoxyphenyl-2,2,2-trichloroethylamide of 4-chloro-phenylsulphonic acid. The blocking effect of trichloroethylamides of sulphonic acids is associated with their electrochemical decomposition on the cathode, which contributes to the introduction of sulphur into the nickel coating in an amount of 0.3-0.4% by weight, thus determining the brightness. It is concluded that the action of trichloroethylamides of carboxylic acids is possibly related to their adsorption on the cathode surface.
Language: English
Subfield: Surfaces, Coatings and Films
Field: Materials Science
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W2883385138