Why we bond and use zincs

[Scott Danforth]

When a picture is worth 1000 words.

this is what happens to stainless when zincs are not maintained in a marina

everything below the waterline is gone...

I do not have the history of the boat, however believe its a 2002/2003 vintage

 

[Grub54891]

Holy****** Seen bad but not that bad.

 

[airshot]

Could easily believe that if it were steel or aluminum but ...stainless steel???? Wow, hard to believe....great lesson here!!

 

[bajaunderground]

If the source was any other than the knowledgeable guys here on iboats, I would argue...holy schnikes...that is corrosion exponentiated!!!

 

[dingbat]

Hard time convincing me that bracket is completely "stainless". Too many different "colors" in the mix. The green would lead me to believe they used a copper base bottom paint which fueled the cocktail

 

[Scott Danforth]

I can fully guarantee the material is 1/2 plate 316L stainless and the bushings are aluminium bronze. Turns out the unit is a 2004 and the zincs were never replaced

 

[fhhuber]

Just little surface rust
It'll buff out.

 

[Grandad]

It's curious that the trim tabs haven't suffered much at all.

 

[SkaterRace]

Wow I have seen bad but that is just beyond imaginable.

 

[fhhuber]

actually it reminds me of the metal after exposure to the acid blood in "Alien"

 

[thumpar]

I am going to guess and say that was probably in salt. That is terrible.

 

[Watermann]

actually it reminds me of the metal after exposure to the acid blood in "Alien"

 

[dingbat]

I can fully guarantee the material is 1/2 plate 316L stainless and the bushings are aluminium bronze. Turns out the unit is a 2004 and the zincs were never replaced

The aluminum bronze bushings would explain it. The 3-5% Fe content of AB wasn't helping..