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PASSIVATION CHEMICALS

 

 

Passivation of metals (fasteners, metal hardware and component parts) is a process of metal corrosion protection with special solutions. Typically, passivation is carried out using salts or oxides (including sodium nitrite). The purpose of passivation is to make the metal surface inactive to the atmospheric air. Passivation can be performed in two main ways - chemical and electrochemical. With chemical passivation parts are immersed in a solution with the desired chemical, whereby at a certain temperature a protective film is formed. Electrochemical passivation is performed as follows. Substances which must be applied to the surface are mixed with an electrolyte. Further, while applying electric current, they are deposited on the surface of the product. The protective layer deposited electrochemically is more uniform, but this method costs significantly more than chemical one.Химия для пассивации цинкового покрытия

Chemicals for passivation

Passivation of fasteners, metal hardware and metal parts involves the formation of phase layers (films) in the interaction with the metal components of the solution in certain circumstances. The film is a dense waterproof barrier, which prevents rusting. The solutions used for passivation are produced by oxidizing agents that form sparingly soluble components. These include chromates, molybdates, nitrates in the alkaline environment. Usually passivated item or product is subjected to further processing. They may be coated with inhibitors (substances that slow or stop unwanted chemical reactions and processes), primers, paints and / or lacquers.

 

Blue passivator for zinc plating ZN-350 series
(suitable for alkaline and acid zinc plating)

 

Chemical composition:Blue and white passivator

Blue and white passivator ZN-350: 10-35 ml / l
A solution of nitric acid, 68%: 10-35 ml / l

Passivation is carried out at standard room temperature by immersion into the solution for 3-10 seconds.

Specification: Coating is uniform, glossy, bright, blue, resistant to discoloration and corrosion.

Passivating is widely used to protect the surface while both the alkaline and acidic galvanizing.

 

Rainbowy passivator for zinc plating ZN-360 series

 

Specification: surface film is a dense uniform barrier of bright, rainbowy color, corrosion resistant.

Yellow Rainbowy passivator for zinc plating has a low cost and simple operation.

Chemical composition:Yellow Rainbowy passivator for zinc plating

Yellow Rainbow passivator ZN-360: 10-35 ml / l

Passivation is carried out at standard room temperature by immersion into the solution for 3-10 seconds.

 

Dark olive green (Khaki) passivator for zinc plating ZN-380 series
(olive zinc passivating)

 

Chemical composition:Olive passivator

Olive passivator ZN-380 100 mg / L

Passivation is carried out at standard room temperature by immersion into the solution for 3-10 seconds. Stirring is performed by means of air or a mechanical stirrer. The drying temperature is 80-110 ℃.

Specification: olive zinc passivating is used for passivation of zinc coatings obtained by electroplating. Ingredients produces rich dark olive green (khaki) zinc coatings. After the process, the coating has a beautiful dark olive (khaki) color and has even higher corrosion resistance than after the rainbowy passivation.

 

Black passivator for zinc plating ZN-370 series
(black passivation of bolts, screws, nuts)

 

Chemical composition:Black passivator

Black passivator ZN-370A: 100 ml / L (60-120 mg / L)
Black passivator ZN-370B: 100 ml / L (60-120 mg / L)

Specification: surface film is a homogeneous solid barrier of brightening color, resistant to corrosion and abrasion.

Passivation is carried out at temperature of 23-29 ℃ (20-35 ℃), pH 2.0 (1,2-2,6) by immersion into the solution for 30-60 seconds

 

Colorless passivator for zinc plating ZN-390 series
(electrodeposition in galvanic drums and suspensions)

 

Chemical composition:Colorless passivator

Colorless passivator ZN-390: 10-20 ml / l

Passivation is carried out at ambient room temperature by immersion into the solution for 5-10 seconds. Stirring is performed by means of air or a mechanical stirrer. The drying temperature is 80-100 ℃.

Specification: surface film is a homogeneous white color barrier.

Colorless passivating is easy to use, ideal for electrodeposition in galvanic drums and suspensions.

 

Colorless passivator for zinc plating WZN-833 series
(contains no chromium)

 

Chemical composition:Colorless passivator

Colorless passivator ZN-833 100 ml / l

Passivation is carried out at ambient room temperature by immersion into the solution for 5-10 seconds. Stirring is performed by means of air or a mechanical stirrer. The drying temperature is 80-110 ℃.

Specification: It contains no chromium, is suitable for zinc plating obtained by treatment in acid and cyanide electrolytes. The surface film is a uniform, bright silvery white glossy barrier.

Colorless passivating simple is in operation, application of the component does not cause difficulties in waste water treatment.

 

Rainbowy passivator for zinc plating by trivalent chromium Cr 3+
(rainbowy chromatizing of zinc surface)

 

Chemical composition:Rainbowy passivator for zinc plating by trivalent chromium Cr 3+

Trivalent passivator: 80-120ml / L

Passivation is carried out at ambient room temperature by immersion in the solution for 30-45 seconds at PH 1.8-2.2

Specification: The technology relates to environmentally friendly in the level of toxicity, does not contain hexavalent chromium.

The surface film is an even barrier of bright yellow color.

 

Blue passivator for zinc plating by trivalent chromium Cr 3+
(blue chromatizing of zinc surface)

 

Chemical composition:Blue passivator for zinc plating by trivalent chromium Cr 3+

Trivalent passivator: 60-100ml / L

Passivation is carried out at ambient room temperature by immersion into the solution for 7-15 seconds and at PH 1.5-2.0

Specification: The technology relates to environmentally friendly in the level of toxicity, does not contain hexavalent chromium.

The surface film is an even barrier of blue color.

Passivator is suitable for both alkaline and acidic galvanizing.

 

Anticorrosion filler (sealer) ZN-110 series
(for further processing of fasteners galvanized surface)

 

Specification: anticorrosive filler (sealer) - a processing aid used in the bath for finishing (curing) of the surface of metal hardware after passivation in baths with a chromate solution to give fasteners additional protective properties and appearance.

Further surface treatment is carried out at temperature of 25℃ by immersion in the solution for 15 seconds and at PH 8.5-10.0. After the treatment it is necessary to remove the solution by natural runoff for 2 minutes and dried for 20 minutes at 80 ° C.

Chemical composition:Dirt additive

Dirt additive ZN-110 200 mg / L

Does not contain chromium, forms a transparent sealed film on the product surface.