Page 164 - REPOWER REFERENCE GUIDE (2020)

Corrosion Protection
Corrosion

NOTE: A complete guide to understanding corrosion and how to protect marine propulsion systems from its damaging effects
can be obtained by ordering Marine Corrosion Protection Guide (90‑881813 01) from Mercury Precision Parts and
Accessories.
General Information

Whenever two or more dissimilar metals (like those found on the sterndrive) are submerged in a conductive solution, such as
saltwater, polluted water, or water with a high‑mineral content, a chemical reaction takes place causing electrical current to flow
between metals. The electrical current flow causes the metal that is most chemically active, or anodic, to erode. This is known
as galvanic corrosion and, if not controlled, it will in time cause the need for replacement of power package components
exposed to water.

Page 6D-2 © 2019 Mercury Marine 90-8M0149179 eng NOVEMBER 2018