173. What Zinc Anodes Do (And Why They Matter More Than You Think)

The Silent Protector of Your Boat

Zincs (anodes) are one of the most important — and most ignored — components on a vessel.

Their job:

👉 sacrifice themselves to protect your metal parts

How They Work

In water, especially saltwater:

• electrical currents cause corrosion
• metal components start to deteriorate

Zinc anodes absorb that corrosion instead.

What They Protect

• propellers
• shafts
• rudders
• trim tabs
• through-hull fittings

When to Replace Them

• when ~50% consumed
• during regular maintenance
• before heavy use seasons

The Risk of Ignoring Them

Without functioning anodes:

👉 your boat becomes the anode

That leads to:

• expensive damage
• weakened components
• long-term deterioration

Final Thought

Zincs are cheap — repairs are not.