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Zinc Electro-Plating

Blue Passivation

BLUE PASSIVATE produces an intensively blue to blue purple, clear, chromate conversion coating on electroplated zinc.

BLUE PASSIVATE brightens, passivates and protects the zinc from discolouration, and finger staining, and imparts added, corrosion protection. Zinc plated parts giving a minimum of 0.003" of zinc will withstand 24 to 48 hours of salt spray after a treatment in BLUE PASSIVATE before the appearance of white corrosion products. Zinc plated parts with a minimum thickness of zinc of 10 microns should withstand salt spray testing ranging from 100 hours to 200 hours before the appearance of red rust.

Yellow Passivation

YELLOW PASSIVATE will produce a yellow colored, iridescent chromate conversion coating on zinc or cadmium. The film formed has excellent corrosion resistance and will meet all specifications calling for a yellow chromate which will withstand 140 hours salt spray. Zinc plated parts with a minimum thickness of zinc of 10 microns should withstand salt spray testing ranging from 250 hours to 500 hours before the appearance of red rust.
YELLOW PASSIVATE films also make an excellent base for the bonding of organic finishes.


Olive-Drab(Green)PASSIVATE produces a heavy olive drab chromate coating on zinc or cadmium plated surfaces.
Olive-Drab(Green)PASSIVATE provides the maximum salt spray and abrasion resistance of any type of chromate dip and is a satisfactory product for meeting Government specifications for this type of finish.
Olive-Drab(Green)PASSIVATE produces an excellent base for subsequent painting and can replace organic type primers for this purpose. The smooth glossy olive drab color produced by Olive Drab(Green)PASSIVATE is an outstanding final finish for many types of applications.
Olive-Drab(Green)PASSIVATE will withstand salt spray testing of 150 -225 hours before the appearance of white rust and 400 - 750 hours before the appearance of redrust.

Black Passivation

BLACK PASSIVATE produces a glossy or matte, black chromate conversion coating on zinc plate, zinc die casting or galvanized parts.
BLACK PASSIVATE provides an excellent base for subsequent paint, lacquer, or enamel finishes. Test results show before a period of 48 hours salt spray red corrosion is present, therefore should not be used for outdoor corrosion purposes.

History of Black Japan

Japan black is a lacquer or varnish suitable for many substrates but known especially for its use on iron and steel. It is so named due to the history of black lacquer being associated in the West with products from Japan.
Its high bitumen content provides a protective finish that is durable and dries quickly. This allowed Japan Black to be used extensively in the production of automobiles in the early 20th century in the United States. It can also be called Japan Lacquer and Brunswick black. Used as a verb, Japan means "to finish in Japan Black." Thus Japanning and Japanned are terms describing the process and its products.
Japan Black's popularity was due in part to its durability as an automotive finish. However, it was the ability of Japan Black to dry quickly that made it a favorite of early mass-produced automobiles such as Henry Ford's Model T. The Ford company's reliance on Japan Black led Henry Ford to quip "Any customer can have a car painted any colour that he wants so long as it is black".
The development of quick-drying nitrocellulose lacquers (pyroxylins) which could be colored to suit the needs of the buying public in the 1920s led to the disuse of Black Japan by the end of the 1920s. Today the name is still know and used but as an alternative Black Passivated Zinc is used by us to produce the black finish required.

TEL: +27 (11) 825-6701 | FAX: +27 (11) 873-9122 | SKYPE team.plating.works
64 Nasmith Ave, Jupiter Ext 5, Germiston, 1400
PO BOX 319, Bedfordview, 2008