How do manufacturers test the resistance of bench materials to salt spray in coastal areas?

Manufacturers rigorously test the resistance of bench materials to salt spray corrosion, a critical concern in coastal areas, primarily through standardized accelerated corrosion testing methods. The most prevalent and internationally recognized method is the Salt Spray (Fog) Test, governed by standards such as ASTM B117.

This process involves placing the bench material sample inside a sealed, temperature-controlled testing chamber. Inside this chamber, a salt solution (typically 5% sodium chloride) is atomized to create a dense, corrosive salt fog. The test subjects the material to this highly aggressive environment continuously for a predetermined period, which can range from 24 hours to over 1,000 hours. The extended duration simulates months or even years of exposure to a coastal atmosphere in a highly accelerated timeframe.

Following the exposure cycle, the sample is carefully removed and evaluated. Inspectors look for the formation of white rust (on materials like aluminum), red rust (on steel), blistering, peeling, or any other signs of coating failure and base metal corrosion. The extent and type of corrosion are compared against established rating scales to assign a protective rating to the material or its coating system. This data allows manufacturers to select appropriate materials, finishes, and coatings—such as powder coatings, specific aluminum alloys, or stainless steel—that will ensure the bench's structural integrity and aesthetic appeal are maintained in harsh, salt-laden coastal environments.