Page 414 - Corrosion Engineering Principles and Practice

382 C h a p t e r 9 A t m o s p h e r i c C o r r o s i o n 383

Changes in mechanical and physical properties of the polymers are
determined for definitive results. Weight gains or losses may be of
interest, but typically do not provide substantive results.
Accelerated cabinet testing of plastic materials can be performed
with essentially the same validity as when testing metallic materials.
Poor materials can be eliminated, but extrapolation of data to forecast
the life of plastic parts in the atmosphere should not be attempted.
ASTM D1499, D2565, and G26 may be used for guidance on the
control of the test cabinet when testing plastics and ASTM D750
should be used for the evaluation of elastomers.
The preventive measures used to ensure the integrity of polymeric
materials are similar to those for metals, that is, the external surface should
be either painted or metal plated to provide a barrier between the material
and the atmosphere. Alloying of the basic material with small amounts of
other resins can often upgrade the stability of these materials.

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