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Zinc and Zinc-Alloy Electroplating.

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Apparatus for applying a zinc or zinc-alloy electroplate to a workpiece comprises an electroplating bath having a pH more than about 14. The electroplating bath includes zinc ions and an additive. A cathode workpiece is in the bath. An anode assembly contacts the bath. The anode assembly includes an anolyte and an insoluble metal anode in the anolyte. The additive is capable of electrolytically breaking down upon contact with the anode. The anode assembly inhibits the electrolytic breakdown of the additive.

Zinc and zinc-alloy plating process

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Zn (alloy) is deposited from aq. acid electrolyte containing Zn salt and, as brightener, heterocyclic aromatic compound with min. 1 alkylated nitrogen atom as hetero atom.

Zinc and zinc-iron alloy plating process

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In electrolytic coating of steel object on at least 1 side in galvanic cell containing soln of Zn and Fe chlorides at pH 0.1-3, using insoluble anodes, Zn or Zn-Fe alloy is deposited, improvement comprising partial flow of soln continually conducted into column filled with metallic Zn, Fe(III) formed during electrolysis is reduced to Fe(II) and Zn dissolved by rinsing surface of steel object with soln, where layer of Zn(alloy) serves as metal source for Zn to be plated, regenerated soln being returned to cell, where for deposition of Zn, soln is maintained at 300-600g/l ZnCl2; and for deposition of Fe-Zn alloy coating, Fe(II) ions at 0.5-60 g/l is included.

Zinc and Zn-Tin Alloy Coatings with and without Chromate Layers. Part I: Corrosion Resistance and Structural Analysis

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JAE

Zinc Anodising

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Anodising of Zn, esp. with a.c is described, graphs show effects of anions, time, c.d and pH on oxide thickness. Salt spray corr'n data is given. 5 refs.

Zinc anodising

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Title coating is formed using AC and is stated to be a misnomer. History is summarised and coating itself noted to be complex mixt. of oxides, phosphates, chromates & fluorides. Conditions for formation of various colours; green, grey, charcoal, brown are listed. Green iridescent coating thickness is listed as function of voltage. Corrosion & abrasion & wear resistance of coatings & dielectric strength are tabulated & application areas noted. 15 refs

Zinc antimonate coating composition coating

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Coating agent comprising (a) particle of Zn antimonate anhydride with zinc oxide/Sb2O5 molar ratio 0.8-1.2, and primary particle size 5-500 nm; and (b) liquid of part- hydrolyzed silane coupling agent, hydrolyzed (m)ethylsilicate or resin emulsion.

Zinc Barium Phosphating of Metal Surfaces

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Zinc Barium Phosphating of Metal Surfaces

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Zinc Barrel Electroplating using Low Cyanide Electrolytes

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JAE Abs. on line. (JA)

Zinc barrel plating on 20 steel ring and coating performance.

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A zinc barrel plating for 20 steel rings was developed. The bath composition and process conditions are as follows: zinc chloride 65-70 g/L, potassium chloride 210-220 g/L, boric acid 30-40 g/L, BH-51 softener 20-40 mL/L, BH-51 brightener 1-3 mL/L, temperature 30-40°C, pH 4.8-5.6, current density 3.0-5.0 A/dm*2, loading capacity 30-40 kg, cylinder rotation speed 7-8 r/min, time 25-35 min. The plating time of the given process is short, and the thickness, appearance, adhesion, hardness and corrosion resistance of the obtained zinc coating meet the requirements of corresponding national standards.

Zinc Based Black Coating on Steel with Other Metals

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Zinc Based Composite Coatings as an alternative to Electrodeposited Cadium

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GB200304305 SIGLE DSC

Zinc Brightener

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Zinc Brightener

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