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Strut channel is made of metal carbon steel which requires protection against corrosion after installation.
Manufacturers either apply plating or galvanize strut in order to help extend the life of the strut. This is typically done after the strut has been cut and punched to help protect all surfaces of the strut. However, not all strut platings or coatings perform the same. Eaton’s B-Line series strut is available with a yellow zinc coating (YZN), while other manufacturers use different means.
Test method
Multiple cut strut channel lengths were exposed to a salt-fog test in accordance to ASTM B117, which requires a fog containing 5-percent salt at a temperature of 95 degrees Fahrenheit over 1,000 hours. A total of three B-Line series strut samples with YZN coating and competitor strut samples were put to the test.
The goal of the test was to determine how long it would take for each strut sample to collect 5-percent white rust on the surface of each sample.
Both the B-Line series strut samples with YZN coating and a competitor solution with GG coating passed the salt-spray test. After 840 hours in the salt-spray test (Image C), the strut samples look to have performed equivalently in regards to the amount of white rust collected on each sample. While both products performed well over the extent of the test, the B-Line series strut with YZN coating passed at the minimum hours required for Type V (colorless passivate) and even exceeded the requirements for Type II (colored chromate coatings), reference image A.
Eaton offers a wide range of B-Line series strut channel, channel fittings, and accessories in a variety of finishes to meet the needs of the application and environment. The B-Line series yellow zinc (YZN) meets or exceeds the ASTM B117 salt tests.
YZN strut is ideal for harsh environments that require protection from corrosion.
YZN strut is ideal for harsh environments that require protection from corrosion. Download the full length white paper to learn more.
