SU463744A1 - Bleaching agent - Google Patents

Description

one

The invention relates to the electrolytic deposition of metallic coatings, in part to the electrolytic deposition of brilliant zinc coatings from alkaline electrolytes using organic gloss-forming additives.

It is known to use galvanizing organic compounds, for example, saccharin, naphthalene sulfonate and gelatins, as a gloss-forming additive to pyrophosphate-ammonium electrolytes.

It is proposed to use an oxime derivative with the general structural formula as a gloss-forming additive in alkaline electrolytes of galvanizing.

OK R

R

where R is H or an alkyl group with the number of atoms With 1 -10;

KlK-H, -OH, -SOsH, -NOa, -NH2, alkyl-, alkoxy-, carbonyl or carboxyl-primer.

This makes it possible to increase the gloss level of the cnc coatings and increase their deposition rate.

As a gloss-forming additive, the following oxime derivatives synthesized by methods of lime are recommended for use: 4-methoxybepaldoxime; 4-hydroxy-3-methoxybenzaloxime; 4-hydroxy-3-ethoxybenzaldoxime; 4-hydroxy-3,5-dimethoxybepzaldoxime.

The brightening agent is introduced into the electrolyte with a simple solution, and the adjustment of the electrolyte according to the brightener is made by introducing it into the electrolyte in an amount of 0.2 g for every 5 hours / l of leaked electricity.

Example 1. Of the electrolyte composition, / l:

Zinc Sulphate90

Potassium pyrophosphate400

Ammoium phosphate 70

4-hydroxy-3-ethoxybenzaloxnm1

at 35C, pH 9.1, stirring and cathode

current density of 4 a / dm precipitated

glossy finish

to silver mirror 76%. Scattering

the electrolyte capacity (Herippa-Blum method) is 27.5%.

Example 2. From the electrolyte composition, g / l: Zinc sulfate90

Potassium pyrophosphate400

The disubstituted ammonium phosphate 70 4-methoxybenzaldoxime 1 at 35 ° C, pH 9.1, stirring and cathode current density 5 ajdM, precipitated zinc coatings with a gloss degree of 71%. The dispersing ability of the electrolyte is 27%. Example 3. From the electrolyte composition, g / l: Zinc sulphate90 Potassium pyrophosphate400 Disubstituted ammonium phosphate 70 4-hydroxy-3-methoxybenzaldoxime I at 35 ° C, pH 9.1, stirring and cathodic current density 5 a / dm precipitated zinc coatings to a degree gloss of 74%. The scattering power of the electrolyte is 29%. Example 4. From the electrolyte composition, g / l: Zinc sulphate90 Potassium pyrophosphate400 Disubstituted ammonium phosphate 70 4-hydroxy-3,5-dimethoxybenzaldoxime 1 at 35 ° C, pH 9.1, stirring and cathode current density 5 a / dm precipitated zinc coatings with a gloss level of 74%. The dispersing ability of the electrolyte is 30.5%. Object of the Invention The use of an oxime derivative with the general structural formula ol HON CH / VR where R is H or an alkyl group with the number of atoms C 1-10; R and GH, -OH, -ZOH, -NOs, -NHs, alkyl, alkoxy, carbonyl or carboxyl groups, - as a brightening agent in alkaline galvanizing electrolytes.