Author Topic: any issues bolting galvanised steel bracket to checker aluminum  (Read 6910 times)

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Offline cancan

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any issues bolting galvanised steel bracket to checker aluminum
« on: December 23, 2010, 08:00:08 PM »
I have a checker plate toolbox and want to bolt 2 L brackets to the lid. I have found the size I want but in Galvanised steel. Is there any long term issues with the 2 metals or should I have a rubber strip between the 2 or find aluminum L brackets instead.
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Offline darren

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Re: any issues bolting galvanised steel bracket to checker aluminum
« Reply #1 on: December 23, 2010, 08:10:35 PM »
Its no good on somthing like a boat but wouldnt worry bout a box at all
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Offline sparksy

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Re: any issues bolting galvanised steel bracket to checker aluminum
« Reply #2 on: December 23, 2010, 09:33:27 PM »
No problems there. The sacrifician anodes  made from zinc are fitted to aluminium hulls and outboards to stop the ali from corroding in salt water, zinc ( most brackets are zinc plated ) is very compatible with aluminium. On the other hand stainless steel hates aluminium and will react sometimes quite radically. Alloy trays and the alloy frames are bolted together with zinc plated bolts and not stainless bolts for that reason.

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Offline V8100

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Re: any issues bolting galvanised steel bracket to checker aluminum
« Reply #3 on: December 23, 2010, 11:13:15 PM »
Gal will be fine but put a small amount of silicone in between
No problems there. The sacrifician anodes  made from zinc are fitted to aluminium hulls and outboards to stop the ali from corroding in salt water, zinc ( most brackets are zinc plated ) is very compatible with aluminium. On the other hand stainless steel hates aluminium and will react sometimes quite radically. Alloy trays and the alloy frames are bolted together with zinc plated bolts and not stainless bolts for that reason.

Wayne
Sorry sparksy but stainless and ally work very well together. There is very little if any reaction between them at all.
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Offline Humbolt

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Re: any issues bolting galvanised steel bracket to checker aluminum
« Reply #4 on: December 23, 2010, 11:52:02 PM »
Yeah sorry but i have to agree with Sparksy, there will be a reaction between alloy and stainless steel. i have seen this many times!!!
It reminds me of when people say stainless doesn't rust, it does given the right circumstance! 

Offline sparksy

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Re: any issues bolting galvanised steel bracket to checker aluminum
« Reply #5 on: December 23, 2010, 11:54:39 PM »
I worked for years installing solar installations with the lighthouse service and a continual problem was the stainless fitting reacting with the aluminium frames of the panels. To such a extent that the stainless bolts "ate" through the aluminium frames.

 If the surface area of the aluminium is greater than the stainless as in the case of using stainless bolts or screws then galvanic corrosion will occur on the aluminium. this is made worse if the surfaces are exposed to the weather.
I now work in the food industry and the same problem exists with stainless bolts etc holding aluminium fixtures.

Just try and remove the bolts holding a outboard motor  together.
Zinc and aluminium are close on a galvanic chart and therefore will show little effect.

Offline RebsWA

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Re: any issues bolting galvanised steel bracket to checker aluminum
« Reply #6 on: December 24, 2010, 01:04:19 AM »
Interesting... I have a 10 year old plate ally boat and all the fittings are mounted with stainless bolts, nuts, screws or self tappers and I never noticed any fretting between the two metals.
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Offline Kameron

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Re: any issues bolting galvanised steel bracket to checker aluminum
« Reply #7 on: December 24, 2010, 03:23:08 AM »
I worked for years installing solar installations with the lighthouse service and a continual problem was the stainless fitting reacting with the aluminium frames of the panels.

Slight hijack sorry:
Did you ever come across a character called Charlie Ferguson?
My family use to have a boat out of Broome (early 90's) that ran service guys to lighthouses up in the kimberleys/rowley shoals etc.

Stainless steel and aluminium don't like each other.  Use a product called Duralac to put between the dissimilar metals, on threads etc. It will stop the galvanic corrosion.

Offline D4D

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Re: any issues bolting galvanised steel bracket to checker aluminum
« Reply #8 on: December 24, 2010, 06:06:59 AM »
x2 for Duralac, use it on my tinnie
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Offline sandman

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Re: any issues bolting galvanised steel bracket to checker aluminum
« Reply #9 on: December 24, 2010, 08:06:24 AM »
In case anyone is interested, I have attached a copy of the Galvanic chart for future reference. Basically the further apart two metals are the more likely there will be a reaction between the metals


Offline LJs GU

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Re: any issues bolting galvanised steel bracket to checker aluminum
« Reply #10 on: December 24, 2010, 08:10:07 AM »
Thanks Sandman, that helps me a lot.  Any chance (if you know how) of linking it to a bigger pic?
Also do you know what the red blocks for the stainless indicate (compared tot he blue blocks)?
 :cheers:
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Offline OffRoadDave

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Re: any issues bolting galvanised steel bracket to checker aluminum
« Reply #11 on: December 24, 2010, 09:27:42 AM »
Cheers for the chart sandman but I'll second LJs ask for a higher resolution image.

Check out the link below, it has a decent size chart and an easy to understand explanation of why the metals react to each other.

http://www.westcoastanodes.co.uk/Boat_Anodes/ANODES_AND_GALVANIC_CORROSION.html
« Last Edit: December 24, 2010, 09:54:03 AM by OffRoadDave »

Offline sparksy

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Re: any issues bolting galvanised steel bracket to checker aluminum
« Reply #12 on: December 24, 2010, 10:49:06 AM »
Quote
Slight hijack sorry:
Did you ever come across a character called Charlie Ferguson?
My family use to have a boat out of Broome (early 90's) that ran service guys to lighthouses up in the kimberleys/rowley shoals etc

Hi Kameron
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