Yellow Zinc Plating

Yellow zinc plating vs.

Yellow zinc plating. When we were deciding what color zinc coating to use for our non powdercoated steel parts that are going to see moisture and salt we were asked whether we wanted to use silver clear zinc or yellow zinc. It is used industrially in chromate conversion coatings having been developed by the ford motor company in the 1920s. Chromate conversion coating or alodine coating is a type of conversion coating used to passivate steel aluminium zinc cadmium copper silver titanium magnesium and tin alloys. Each color offers different levels of corrosion protection.

The dilemma clear zinc silver zinc or yellow zinc plating. The process may be done in plating barrels or by racking the individual parts and usually involves cleaning activating zinc plating chromate conversion coating and drying with good rinsing between each stage. Plating thickness can be regulated for a very thin coating of 00015 to 001 for severe corrosive environments. Zinc plating is a most valuable tool when used in combating corrosion of steel.

Liquid concentrate is used at 0 5 to 3 by volume in water at 65 to 90 f. A metallurgical bond is formed between the zinc and steel forming an iron rich alloy with tenacious bond. I was hoping to reach out to you to help me with this research. P 1265 the coating serves as a corrosion inhibitor as a primer to improve the adherence of paints and adhesives as a decorative finish or to preserve electrical conductivity.

I am trying to persuade our engineering department to allow us to make the switch to have our hardware clear zinc plated. The yellow chromate is a yellow bronze iridescent finish on plated cadmium and zinc. Yellow zinc plating means zinc plating followed by a yellow chromate conversion coating. Zinc plating is one of the more versatile plating finishes.

A discussion started in 2011 but continuing through 2018. The finish has outstanding resistance to salt spray greatly surpasses the normal 96 hour salt spray resistance specified for yellow chromates on zinc. Zinc chromate zn cr o 4 is a chemical compound containing the chromate anion appearing as odorless yellow powder or yellow green crystals but when used for coatings pigments are often added. The zinc corrodes before the steel does sacrificing itself for the benefit of the steel.