Corrosive Atmosphere tests are performed to determine the effects of an acidic atmosphere on equipment or materials. These conditions may be either naturally occurring conditions or a result of man made pollutants. Typical atmospheres are comprised of salt (NaCl) spray with additional contaminants, such as sulfur dioxide. The effects can be divided into four broad categories:

Effects

Corrosion of finishes

Corrosion of components such as precision springs

Impairment of electrical operations

Impairment of mechanical operations

Procedure

This test is typically performed in a test chamber at an elevated temperature of approximately 90° F. The test unit is suspended in a corrosive atmosphere, sometimes in combination with an atomized salt solution, for a typical duration of from seven to thirty days. The most common corrosive component is sulfur dioxide, which combines with moisture to form acid rain, a mild solution of sulfuric acid.

Applications

Exposed equipment on the flight deck of an aircraft carrier

Equipment in an industrial environment

Equipment mounted in or around a smokestack

Telecommunications central office equipment