Corrosion and Galvanic Compatibility Knowledge
Corrosion Testing Equipment
The corrosion design techniques discussed in this section are a summary of recommended Dos based on features that have displayed significant impact on the durability and reliability of your product and equipment in service.
- Design on the assumption that moisture and other corrosive mechanism will be present.
- Seal all dissimilar metal (galvanic) couples.
- Use conformal coating on printed wiring boards.
- Use as easily replaceable anodic (consumable) part in assembling grounding or bonding connections.
- Use only electrical connector boots that can be sealed with adhesives.
- Carefully select a protective system for use on magnesium.
- Complete the working of aluminum, steel, etc (drilling, cutting, grinding) prior to surface treatment.
- Use surface treatments (anodize and conversion coatings) on aluminum.
- Carefully select the metal plating use to provide sacrificial protection, barrier protection, as a third metal between two otherwise incompatible metals, or as a substitute surface.
- Use a nickel strike under gold plating.
- Use solder flux with lowest possible acid content.
- Use metallic materials with the most corrosion resistant configuration (passivated) with minimum possible residual stressing.
- Use fluorocarbon or fluorosilicone type materials for gaskets, O rings an seals.
- Use low point drains.
- Mount equipment an components at least 1/2 inch above potential standing water level.
- Use hermetic sealing where possible.
- Design for maintainability.
- Use shoe box lids on enclosures.
- Mount PWBs vertically with the edge connectors on vertical edge or back of board.
- Mount electrical connectors horizontally.
- Use drip loops on electrical cables and piping.
- Use desiccant systems with visual indicators.
- Use cooling systems that remove moisture and particulate matter.
- Use O rings to seal around control shafts that must penetrate into an corrosive environment.
- Be aware of various interior and exterior fluids which your product will be exposed to.
- Recognize the operational environment.
- Recognize the maintenance environment.
- Be aware of maintenance procedures and materials.
- Listen to feedback!