Strange corrosion - SailNet Community
 2Likes
  • 1 Post By Maine Sail
  • 1 Post By RichH
 
LinkBack Thread Tools
post #1 of 7 Old 12-25-2011 Thread Starter
Senior Member
 
L124C's Avatar
 
Join Date: Oct 2007
Posts: 1,435
Thanks: 58
Thanked 6 Times in 6 Posts
Rep Power: 8
 
Strange corrosion

I'm looking at a Islander 30 fixer. Both flush mount bow nav light housings show heavy corrosion that I've never seen on anything that hasn't been submerged. The boat needs work, but I don't see any other signs that it was sunk. This is the only metal on the boat that looks like this. Thoughts?

Completely unrelated, but, it just occurred to me....shouldn't another boat be able to see both lights when directly off the bow ( at 12 o'clock)? Seems to me that since the lights are recessed in the hull, another vessel couldn't see either! How does that work?
Attached Thumbnails
1223111617a.jpg  

Last edited by L124C; 12-25-2011 at 04:37 PM.
L124C is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 7 Old 12-25-2011
Senior Member
 
celenoglu's Avatar
 
Join Date: Dec 2008
Posts: 672
Thanks: 0
Thanked 14 Times in 13 Posts
Rep Power: 7
 
This type of corrosion is not rare. But the metal is not fit for marine use.

The lights can be seen from 12:00 if you are far enough.
celenoglu is offline  
Quote Quick Reply Share with Facebook
post #3 of 7 Old 12-25-2011
Senior Member
 
Maine Sail's Avatar
 
Join Date: Jan 2003
Location: Maine Coast
Posts: 5,887
Thanks: 20
Thanked 222 Times in 169 Posts
Rep Power: 16
       
Quote:
Originally Posted by L124C View Post
I'm looking at a Islander 30 fixer. Both flush mount bow nav light housings show heavy corrosion that I've never seen on anything that hasn't been submerged. The boat needs work, but I don't see any other signs that it was sunk. This is the only metal on the boat that looks like this. Thoughts?

Completely unrelated, but, it just occurred to me....shouldn't another boat be able to see both lights when directly off the bow ( at 12 o'clock)? Seems to me that since the lights are recessed in the hull, another vessel couldn't see either! How does that work?
Most likely older Perko chrome plated zinc alloy... One of the dumbest ideas to ever hit boating...
SloopJonB likes this.

______
-Maine Sail / CS-36T


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.




Images In Posts Property of Compass Marine Inc.



Last edited by Maine Sail; 12-25-2011 at 06:52 PM.
Maine Sail is offline  
Quote Quick Reply Share with Facebook
post #4 of 7 Old 12-25-2011
TQA
Bombay Explorer 44
 
TQA's Avatar
 
Join Date: Apr 2009
Posts: 2,937
Thanks: 0
Thanked 79 Times in 75 Posts
Rep Power: 7
 
The tops of my 70s Barients self tailors look like that.
TQA is offline  
Quote Quick Reply Share with Facebook
post #5 of 7 Old 12-25-2011
Senior Member
 
RichH's Avatar
 
Join Date: Jul 2000
Location: Pennsylvania
Posts: 3,549
Thanks: 24
Thanked 165 Times in 154 Posts
Rep Power: 16
 
The corrosion is zinc oxide which is 'extracting' from a poured casting of *pot metal* or *white metal* an inexpensive and dubious alloy of mostly zinc and varying % of tin, aluminum, magnesium, lead, etc. In the foundry trade this was also called *monkey metal*. This is a very weak alloy which quickly corrodes in the presence of water, especially seawater even if plated with nickel or chrome.

Last edited by RichH; 12-25-2011 at 09:20 PM.
RichH is online now  
Quote Quick Reply Share with Facebook
post #6 of 7 Old 12-26-2011 Thread Starter
Senior Member
 
L124C's Avatar
 
Join Date: Oct 2007
Posts: 1,435
Thanks: 58
Thanked 6 Times in 6 Posts
Rep Power: 8
 
Quote:
Originally Posted by celenoglu View Post
This type of corrosion is not rare. But the metal is not fit for marine use.
Ain't that the truth!
The lights can be seen from 12:00 if you are far enough.
I wonder how, since the hull and light fixture itself seem to be in the way. In any case, it's the close boats I'm worried about!
L124C is offline  
Quote Quick Reply Share with Facebook
post #7 of 7 Old 12-27-2011
Senior Member
 
RichH's Avatar
 
Join Date: Jul 2000
Location: Pennsylvania
Posts: 3,549
Thanks: 24
Thanked 165 Times in 154 Posts
Rep Power: 16
 
These hull mounted 'eyeball type' navigation lights were deemed 'inefficient for visibility and safety' by the worlds marine community ... in about ~1967(?). And by universal agreement (ABYC, SOLAS, ABCDEFG, etc. etc.) none were installed on recreational, etc. boats after that time.
OPossumTX likes this.
RichH is online now  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Strange Catalina 22?? catfish26 Boat Review and Purchase Forum 10 02-15-2013 07:42 PM
Strange winds ardoin Seamanship & Navigation 10 03-13-2009 10:50 AM
Strange Rules gdavids Announcements and Suggestions Box 6 09-14-2007 11:26 AM
Strange Start lefty Racing 3 05-25-2001 06:06 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome