SailNet Community - Reply to Topic

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance > Painting aluminum
 Not a Member? 


Thread: Painting aluminum Reply to Thread
Title:
  

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

Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:
 

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:

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.



Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Topic Review (Newest First)
04-21-2009 04:19 PM
noelex77 Titanium causes less galvanic problems than its position on the galvanic series would suggest because the titanium oxide coating is less electrically conductive than ss.
There is ,however, no need for titanium in this application unpainted marine alumium wont corode as long as you isotate the disimalar metals. Duralac is simple and effective.
The genset may need to be electrically isolated from the negative pole
04-21-2009 03:43 PM
mepsnbarry Titanium screws do sound like an interesting idea here, but they probably won't help corrosion as much as you think.

I just checked a galvanic series chart, and found that they are slightly worse than stainless in this regard--they are above stainless on the chart, or in other words, FARTHER from aluminum on the chart.

It is possible that the corrosion that forms between aluminum and titanium is less of a problem than the stuff that makes such a mess out of aluminum with stainless fasteners, but I wouldn't even count on that--I believe it is the less noble metal (aluminum) which corrodes, so I expect it will form the same oxides.

Perhaps Ti are strong enough to unscrew rather than shearing off like SS bolts do though?

If anybody has seen what Ti fasteners in Al look like after 10 years in a salty environment, let us know!
11-17-2008 11:50 PM
poopdeckpappy Try Mettec Makers of quality Titanium Fasteners, Motorsports Products, and Motorcycle Accessories. they have 3/8-16 x 4

This is were I got all my stuff
11-17-2008 10:59 PM
heinzir
Quote:
Originally Posted by poopdeckpappy View Post
Has anyone given much thought to titanium fasteners, they aren't that mush more in cost, but 2/3rds less in weight and 2/3rds more in strength and you wont have the galvanic issues.

All my race bikes had all the fasteners, axles, pinion pins the works replaced with TI and never had a corrosion issues between the TI & ALU, not to mention I shed about 7-10 pounds off the bike.

I'm bet'n their some poundage that could be shed off the spars and even deck hardware fasteners

Just a thought
That is an intriguing thought. Even a half pound saved aloft could make some difference on my little boat. The published displacement is only 2000 lbs.

I did a quick Google search for titanium fasteners and did not find what I would need: (3) 3/8" x 4" bolts w/nyloc nuts. All of the sites I checked out had either smaller diameter/shorter lengths or they only sold industrial quantities. Where could I find appropriate titanium fittings w/o breaking the bank?
11-17-2008 09:18 PM
sailingdog While titanium doesn't corrode too readily... it does cause serious galvanic corrosion issues when in close proximity to less noble metals in a saltwater situation.

For some reason, I doubt your bike was used much in a salt water environment.
Quote:
Originally Posted by poopdeckpappy View Post
Has anyone given much thought to titanium fasteners, they aren't that mush more in cost, but 2/3rds less in weight and 2/3rds more in strength and you wont have the galvanic issues.

All my race bikes had all the fasteners, axles, pinion pins the works replaced with TI and never had a corrosion issues between the TI & ALU, not to mention I shed about 7-10 pounds off the bike.

I'm bet'n their some poundage that could be shed off the spars and even deck hardware fasteners

Just a thought
11-17-2008 09:17 PM
trintella49
Aluminum Vessels

Dissimilar metals are enemies forever (even similar metals do not like each other) Paints and other covers are very difficult to cover aluminum. I suggest, unless you absolutely have to do not do it.
I have an aluminum sailing vessel (Trintella49A).
All possible means and methods were taken to place a barrier between the Alu structure and components.
The Generators sit atop of Wood. The wooden platform connectors have no direct connection with the Generator and Ships Frame.
Another major concern must be the electrical connections / Grounding (Floating) from the generators to the rest of the electrical and electronic systems. Be very careful.
Happy to give you some of my insight.

Regards, charles
11-17-2008 08:31 PM
CharlieCobra You can probably get them from an Auto Paint supplier. The Alumagrip? It's been a while but it's a US Paint product, the same company that makes Awlgrip.
11-17-2008 08:25 PM
poopdeckpappy LOL, it was a in general type thought, but in the back of your mind, do you really want to get beat by that 35999 lb boat.........I think not
11-17-2008 08:15 PM
svindigo Hello Charlie - Thanks for the detail. It's more than I was planning to do but I'd like to do it right if it's to be done. I can find the zinc chromate primer but are the other items readily available to non aviation mechs?

Hi Xort, the only source of saltwater would be from a leak otherwise it should remain dry. Isolation is on the list of things to accomplish one way or the other in this job. It's not an aesthetic project but I want it to look good when done (and for some time afterward)

Pappy - While I agree with your logic and experience on bikes it probably wouldn't be worth it for me. The weight savings would go unnoticed in our 36000 lb baby unless it was part of a comprehensive Ti upgrade. As it is I'll be using 4 bolts to secure the generator to the Al frame.

Ike
11-17-2008 07:42 PM
poopdeckpappy
Quote:
Originally Posted by sailingdog View Post
If the fasteners are stainless steel, don't forget to use isolation washers of thin plastic and either TEFGEL or LANOCOTE on the bolts themselves to help prevent galvanic issues between the aluminum and stainless steel.
Has anyone given much thought to titanium fasteners, they aren't that mush more in cost, but 2/3rds less in weight and 2/3rds more in strength and you wont have the galvanic issues.

All my race bikes had all the fasteners, axles, pinion pins the works replaced with TI and never had a corrosion issues between the TI & ALU, not to mention I shed about 7-10 pounds off the bike.

I'm bet'n their some poundage that could be shed off the spars and even deck hardware fasteners

Just a thought
This thread has more than 10 replies. Click here to review the whole thread.

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


All times are GMT -4. The time now is 09:34 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.