Corrosion and Galvanic Compatibility Knowledge
Corrosion Testing Equipment
The design techniques discussed in this section are a summary of recommended Don'ts based on features that have displayed significant impact on the durability and reliability of your product and equipment in service.
- Dont use dissimilar metal (galvanic) couples if it can be avoided.
- Dont use RTV that contains acetic acid.
- Dont use heat shrink (non-sealed) electrical connector boots to stop moisture fluid intrusion.
- Dont mate magnesium to a metal more cathodic than aluminum.
- Dont use acrylic, RTV or varnish type conformal coatings.
- Dont use gold over silver or copper.
- Dont use organic materials that outgas, support fungi, absorb moisture or are degraded by maintenance and operational fluids.
- Dont use an EMI gasket without a seal on both sides of the conductive element.
- Dont use top mounted lid fasteners.
- Dont mount PWBs horizontally.
- Dont mount electrical connectors (multicontact or coaxial) vertically.
- Dont place edge connectors on the bottom edge of a vertically PWB.
- Dont create side loads or cable tension on the rear seal of electrical connectors.
- Dont use direct air cooling on active electronic components.
- Dont mount equipment less than 1/2 inch above the compartment floor.
- Dont use hygroscopic materials.
- Dont use nickel plated electrical connector shells in salt or high humidity environments. (Use cadmium plated shell).
- Dont use foam cushioning material that can deteriorate (revert).
- Dont permit the presence of water trap areas.