FED-STD-791D
Method 4001.3
September 30, 1986
CORROSION PROTECTION COATING: SALT-SPRAY (FOG) TEST
1. SCOPE
1.1 This method is intended for the determination of the corrosion protection
provided by fluid, semi-solid, and solid coatings.
2. SUMMARY
2.1 The test consists of exposing test panels to either 5 or 20% salt (NaCl) spray
as stated in the product specification. When the salt concentration is not stated in the
product specification, the 5% salt solution shall be used.
3. SAMPLE SIZE
3.1 Approximately 500 mL of the material to be tested.
4. REFERENCES, STANDARDS, AND APPARATUS
4.1 Exposure chamber, with racks for supporting test panels, and with suitable
heaters and controls.
NOTE 1:
The chamber and all accessories shall be made of material which will not
affect the corrosiveness of the fog (such as glass, hard rubber, plastic, or
wood other than plywood.) In addition, all parts which come in contact
with the test panels shall be of materials that will not result in accelerated
local attack associated with dissimilar metal crevices. The chamber and
accessories shall be so constructed and arranged that there is no direct
impinging of the spray or dripping of the condensate on the test panels, so
that the spray circulates freely about all panels to the same degree and so
that no liquid which has come in contact with the panels returns to the salt
solution reservoir. The chamber shall be properly vented. Satisfactory
cabinets may be obtained from the Industrial Filter and Pump Mfg. Co.,
Chicago, Illinois.
4.2 Atomizers, including suitable nozzles and compressed air supply
(for
producing a finely divided, wet, dense fog).
4.3 Humidifier, atomizer-air (for warming and humidifying the air to produce a
relative humidity at the nozzle of at least 85%).
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