Ask the Expert: How are fleets affected by galvanic corrosion?

March 31, 2015
It does not happen with all touch points of different metals, just between metals that are far away from each other on the electricrochemical potential series.

Q: How are fleets affected by galvanic corrosion?

A: It is a special type of corrosion that can occur where dissimilar metals are touching. These are galvanic corrosion hot spots. It does not happen with all touch points of different metals, just between metals that are far away from each other on the electricrochemical potential series. The worst and unfortunately the most common combination of dissimilar metals found are aluminum and stainless steel.

When in contact with each other, they act just like a battery where electrons flow from the aluminum to the stainless steel. In this scenario the aluminum will corrode extremely fast, leaving behind a white dust of aluminum oxide. Conversely, the stainless steel will be pristine and have extra life thanks to electrons the aluminum has so graciously donated. Yes, aluminum can "rust." Any metal can rust. Often, the rust or oxidation is not the red rust we are accustomed to see on steel, but a clear or white in color. These areas of galvanic corrosion are preventable by redesigning the hinges or fasteners, or placing non-conductive insulators between the dissimilar metals. Just painting over them is adding a longer fuse to a problem waiting to explode.

Information provided by: Sherwin-Williams Automotive Finishes 

Sponsored Recommendations

ZEUS+: The Cutting-Edge Diagnostic Solution for Smart, Fast, and Efficient Auto Repairs

The new ZEUS+ simplifies your diagnostic process and guides you through the right repair, avoiding unnecessary steps along the way. It gives you the software coverage, processing...

Diagnostic Pre- and Post-scan Reports are Solid Gold for Profitability

The following article highlights the significance of pre-scans and post-scans, particularly with Snap-on scan tools, showcasing their efficiency in diagnosing issues and preventing...

Unlock Precision and Certainty: TRITON-D10 Webinar Training for Advanced Vehicle Diagnostics

The TRITON-D10 lets you dig deep into the systems of a vehicle and evaluate performance with comparative data, systematically eliminating the unnecessary to provide you with only...

APOLLO-D9: Trustworthy Diagnostics for Precision Repairs

The APOLLO-D9 provides the diagnostic information and resources you need to get the job done. No more hunting through forums or endlessly searching to find the right answers. ...

Voice Your Opinion!

To join the conversation, and become an exclusive member of Vehicle Service Pros, create an account today!