GALVANIZING STEEL OLIVE

Characteristics

Advantages of galvanizing:

• Khaki zinc provides the highest anti-corrosion characteristics among all types of chromate - better than with colorless or iridescent passivation. The coating is anodic in relation to iron up to 70°C, which allows us to talk not only about the mechanical, but also about the electrochemical nature of the protection of parts from corrosion. Protection is evident even when there is damage to the coating that extends to the steel base. At temperatures above 70°C zinc becomes a cathode, protection becomes purely mechanical.
• Zinc prevents contact corrosion of steel when combined with aluminum products.
• Ensures easy screwing of threaded parts. It is often used on parts of high-pressure hoses.
• Olive chromate zinc both improves the appearance of the coating and matches the color of matte military green paint. 
• Olive, like rainbow film, has the property of “self-healing”. It is able to restore its properties in case of minor mechanical damage, such as scratches. Chromite, phosphate and oxide films do not have this effect.
• The khaki zinc coating produced at our enterprise is ductile, withstands bending and flaring, thanks to the use of unique shine-forming additives in the electrolyte. It also has a high uniformity in thickness, which is confirmed by metallographic studies:

A microphotograph of a cross-section of the coating is shown below:

Disadvantages of galvanizing:

• Olive chromate film on zinc is not resistant to abrasion.
• Electrochemical galvanizing causes some loss of steel ductility due to hydrogenation. Steels with a tensile strength higher than 1380 MPa are not subject to galvanizing. 
• Zinc has increased brittleness at temperatures above 250°; C and below minus 70° C.
• Olive chromate film has the lowest electrical conductivity compared to all other types of chromate.