Rust treatment

electrolyte zinc plating

Electroniquel rohs compliant

ZINC PLATED

ELECTROLYTIC ALLOY

Electrolytic zinc plating or electro-zinc plating is a widely extended method for the protection of steel, because it provides reasonable protection with a pleasant appearance and at low cost. Zinc protects steel through two mechanisms: on the one hand, it exerts a barrier effect, isolating the steel from the aggressive environment and on the other hand it acts as a sacrificial anode, slowing down the corrosion of the steel.

The service life of a zinc coating depends directly and linearly on the thickness of the coating. Additionally, the useful life of this type of coatings can be extended by applying chromate conversion coatings. These coatings are made up of thin films (between 0.01 and 1 µm) of inorganic compounds, which are formed by the contact of the metal surface with an aqueous solution containing soluble chromates. This type of coatings, in addition to improving corrosion resistance, allows the application of a subsequent organic coating.

The main advantages of electrolytic zinc plating with respect to hot galvanizing are better adhesion and that when working at room temperature, the parts do not suffer deformation due to the effect of temperature.

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electrolytic coating

GENERAL ZINCING PROCESS

The zinc plating process is carried out by immersion in the different galvanic baths, which operate at low temperatures (<50ºC), which avoids the deformation of the pieces during their treatment. Iron is mainly protected, but other metals, such as copper, brass or zamak ELECTRONIQUEL can also apply this treatment

Treatment
Deposition
Dehydrogenated
Passivated
Inspection

Electroniquel uses an alkaline cyanide-free process for zinc plating, which implies a better distribution on the surface of the part and less hydrogenation of the base metal. Taking into account that the cyanides traditionally used in zinc baths carried out a cleaning action, with the processes exempted, the pretreatment stages acquire more importance, being usual the combination of pickling with chemical and electrolytic degreases to achieve a good adhesion between the zinc. and the base metal.

  • Treatment

    Degreasing and pickling

    To achieve adhesion of the zinc-nickel alloy on a metal part, degreasing and pickling steps are carried out. DEGREASING: the objective is to eliminate the oils and greases that we have on the surface of the piece. PICKLING: in this stage the surface oxides adhered to the surface of the steel are eliminated by immersion in acid solutions, thus removing the scale from previous processes such as rolling.

  • DEPOSITION

    COATING THE PART

    Depending on the service condition, the thickness of the deposited layer can vary between 5-25 microns. The deposit obtained in this way is an ideal base for subsequent passivation treatments, which improve corrosion resistance and modify its appearance.

  • Dehydrogenation treatment

    heat treatments

    If required (tensile strength greater than 1000 MPa), the part will be dehydrogenated at almost 200ºC for a variable time depending on the hardness of the part.

  • conversion coating

    passivation

    Passivation is the generation of a conversion coating that is applied to improve the corrosion resistance of the part and that modifies its appearance. After passivation, it is possible to subsequently apply a sealing stage, which penetrates the passivation, closing the micro-pores, increasing the white corrosion of the part.

  • inspection

    behavior control

    Inspections that we carry out throughout the process, mainly on the galvanic baths and on the product once it is finished. Appearance tests: examine the coating with an amplitude of 10%. Layer thickness: measure on a significant surface by X-ray spectrometry s / n ISO 3497. Adhesion: There will be no flaking or blistering of the pieces after keeping them at 220 ± 10 ºC for 30 minutes with immediate immersion in water at 15-25ºC. s / n ISO 2819. Corrosion resistance: Accelerated salt spray tests s / n ISO 9227.

ZINC PLATED FINISHES

Zinc plated with white, olive green, iridescent, yellow and black finishes

clear passivated zinc sealing POSSIBLE

Zn/An/T0

IRIDESCENT PASSIVE ZINC sealing POSSIBLE

Zn/Cn/T0

BLACK PASSIVE ZINC POSSIBLE SEALING

Zn/Fn/T0

OLIVE GREEN PASSIVED ZINC sealing possible

Zn/D/T0

YELLOW PASSIVE ZINC sealing possible

Zn/C/T0

IRIDESCENT PASSIVE ZINC sealing possible

Zn/Cn/T2

Zinc plating characteristics

esthetic, durability and profitability

Conservation and protection

Zinc plating is a widely used method for protecting steel against oxidation and corrosion, also improving its visual appearance and at low cost.

Minimum coating thickness

These coatings are made up of thin films (between 5-25 microns) of inorganic compounds, which are formed by the contact of the metal surface with an aqueous solution containing soluble chromates.

Good finish

When working at room temperature, the pieces do not suffer deformation due to the effect of temperature.

Alkaline zinc plating without cyanides

Electroniquel uses a cyanide-free alkaline process for zinc plating, which implies a better distribution on the surface of the part and less hydrogenation of the base metal.

Aplicación por inmersión

El proceso de zincado se realiza por inmersión en los diferentes baños galvánicos, que operan a bajas temperaturas (<50ºC), lo que evita la deformación de las piezas durante su tratamiento.

Static drum or rack application

Electrolytic pan zinc plating is used for large series of small parts. It is used for metal die-cutting, turning, turners ...

Good base for subsequent coating

This type of coatings, in addition to improving resistance against oxidation and corrosion, allows the application of a subsequent organic coating.

Excellent substitute for Galvanized

The main advantages of electrolytic zinc plating with respect to hot galvanizing are better adhesion and that when working at room temperature, the parts do not suffer deformation due to the effect of temperature.

industrial application of electrolytic zinc plating

PROTECTION

48H without red corrosion | 5 microns with white passivate

36 h sans corrosion rouge | 12 microns avec passivation irisée

480 h without red corrosion | 12 microns with iridescent passivated and sealed

certifications and standards

ELECTRONIQUEL CERTIFIES ALL ITS TREATMENTS BASED ON THE SPECIFIC STANDARD, APPROVAL OR TESTS

certificat électroniquel

ISO 2081:2018 CERTIFICATION

Metallic coatings and other inorganic coatings. Electrolytic zinc coatings with supplementary treatments on iron or steel

ISO 19598:2016 CERTIFICATION

Metallic coatings. electrolytic coatings of zinc and zinc alloys on iron or steel with supplementary treatment without Cr (VI)

UNE 112050:1994 regulation

Chromic conversion layers on zinc and cadmium electrolytic coatings

ASTM B633-19 SPÉCIFICATION

Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel

5238,5149,5216,5224,5212,5220,5223,5149,5173,5149,5214,5226,5224,5216,5229,5214,5220,5212,5223,5179,5216,5223,5216,5214,5231,5229,5226,5225,5220,5228,5232,5216,5223,5161,5216,5230,5149,5159,5149,5230,5232,5213,5221,5216,5214,5231,5149,5173,5149,5182,5226,5225,5231,5212,5214,5231,5226,5147,5202,5184,5181,5147,5184,5223,5216,5214,5231,5229,5226,5225,5220,5228,5232,5216,5223,5149,5240
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Contact

  • ADDRESSAvenida de la Siderurgia 1
    Pol. Ind. Bankunión 2
    33211 Gijón - ASTURIAS (ESPAÑA)
    TELEPHONE AND FAX+34 985 323 912
    +34 985 312 318
    comercial@electroniquel.es