Like Tree0Likes

Freeing up a corroded stainless/aluminum joint

Reply
Old 01-10-2008, 02:36 PM
  #1
Diamond Member #001
Charter Member
Thread Starter
Trade Score: (2)
 
C_Spray's Avatar
 
Join Date: Oct 2000
Location: Coastal North Carolina
My Boats: 2000 Formula 382 with Innovation 600's
Posts: 4,789
Default Freeing up a corroded stainless/aluminum joint

OK you chemists and shadetree repair experts, here's a good one for you:

I have a stainless part that is screwed into an aluminum part. This area has been assembled for several years and subjected to both salt and fresh water. Since the two materials have very dissimilar galvanic properties, they have pretty extensively corroded together. I have tried brute force, heat, and a good soaking with a spray lubricant without success. I have read that the phosphoric acid Coca-Cola will dissolve rust on mild steel, but does anyone know if this trick will work in this case as well? If not, I'm open to other suggestions as well.

Help!
__________________
Retired! Boating full-time now.
C_Spray is offline  
Reply With Quote
Old 01-10-2008, 02:38 PM
  #2
Registered
 
Wardey's Avatar
 
Join Date: Nov 2001
Location: Palm Harbor, FL
My Boats: 2005 Extreme 29
Posts: 3,959
Default

Good Luck !!! I have "seized" stainless and aluminum together and NEVER got it apart !!!! Time for the torches / saws all and new parts. Sorry, Dave
Wardey is offline  
Reply With Quote
Old 01-10-2008, 02:41 PM
  #3
Diamond Member #001
Charter Member
Thread Starter
Trade Score: (2)
 
C_Spray's Avatar
 
Join Date: Oct 2000
Location: Coastal North Carolina
My Boats: 2000 Formula 382 with Innovation 600's
Posts: 4,789
Default

After bailing me out on the engine connector deal, you're going to let me down on this one? OH - Man!!!!

Maybe Brownie will know.......
__________________
Retired! Boating full-time now.
C_Spray is offline  
Reply With Quote
Old 01-10-2008, 03:27 PM
  #4
Charter Member
Charter Member
Trade Score: (1)
 
Ted G's Avatar
 
Join Date: Jan 2001
Location: Edgerock Baby!!
My Boats: Marlago 35 FS, 18 Neptune CC
Posts: 7,661
Default

Chuck, have you tried PB Blaster, best stuff I've ever used. If not, how big is this part?
__________________
Chesapeake Bay Powerboat Association
www.cbpba.com
Ted G is offline  
Reply With Quote
Old 01-10-2008, 03:38 PM
  #5
Diamond Member #001
Charter Member
Thread Starter
Trade Score: (2)
 
C_Spray's Avatar
 
Join Date: Oct 2000
Location: Coastal North Carolina
My Boats: 2000 Formula 382 with Innovation 600's
Posts: 4,789
Default

It's a 1"-14 thread into a thinwall aluminum tube. The tube was anodized, but has actually begun to corrode away completely now....
__________________
Retired! Boating full-time now.
C_Spray is offline  
Reply With Quote
Old 01-10-2008, 03:40 PM
  #6
Registered
 
Join Date: Jul 2007
Location: Austin,Texas
Posts: 2,111
Default

Quote:
Originally Posted by insptech View Post
Chuck, have you tried PB Blaster, best stuff I've ever used. If not, how big is this part?
If that doesn't work combined with heat it's time to give up.
MOBILEMERCMAN is offline  
Reply With Quote
Old 01-10-2008, 03:57 PM
  #7
Registered
 
DaveP's Avatar
 
Join Date: Oct 2000
Location: Toms River, NJ
My Boats: 2004 36 Concept
Posts: 2,740
Default

Try Jack Daniels. Must be a fresh bottle.

Pour 1% on the parts that are corroded.

Then drink the other 99%
DaveP is offline  
Reply With Quote
Old 01-10-2008, 04:02 PM
  #8
Offshoreonly Advertiser
Offshoreonly Advertiser
 
Join Date: Jan 2001
Location: spring valley,ny usa
My Boats: varied
Posts: 1,991
Stuck Fitting

Have BAJABOB 38 breathe on it !
sy goldberg is offline  
Reply With Quote
Old 01-10-2008, 04:17 PM
  #9
Registered
 
BY U BOY's Avatar
 
Join Date: Aug 2005
Location: HOUSTON ,TX
My Boats: 91 Scarab 21' Excel/1999 Proline 200 sport
Posts: 8,778
Default

soak it in some hot coke.
BY U BOY is offline  
Reply With Quote
Old 01-10-2008, 04:29 PM
  #10
Registered
 
JLAY's Avatar
 
Join Date: Jun 2005
Location: Chalmette,Ponchatoula, Louisiana
My Boats: 14' go-devil mud boat 22' Apache Scout
Posts: 408
Default

I use Kroil on a lot of corroded things and sware by it. It is used a lot in oil refineries.
JLAY is offline  
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
txriverrat2001
General Q & A
6
08-13-2008 02:24 PM
jdub
General Boating Discussion
2
05-28-2007 07:21 AM
offshorefisher
General Q & A
2
09-16-2006 06:38 PM
splashandburn
General Boating Discussion
10
12-18-2003 11:20 AM
Laktrash
General Q & A
3
03-23-2003 04:27 PM



Posting Rules
You may not post new threads
You may not 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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 10:34 AM.


Copyright 2011 OffShoreOnly. All rights reserved.