Thoughts on a Tikka?

Nikon pro staff 5!

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Originally Posted by jaycee

Well , how do the manufactures of shot guns get away with it , [ using aluminum receivers and steel barrels ] ?
My daughters pump action win. 12 gauge has an aluminum receiver , the rest is steel.

Yes I know that galvanic corrosion does take place , but here is the explanation;

Galvanic corrosion is an electrochemical process in which one metal corrodes preferentially to another when both metals are in electrical contact and immersed in an electrolyte. This same galvanic reaction is exploited in primary batteries to generate an electrical voltage.

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Try using steel screws in an aluminium boat. Rainwater is acidic = electrolyte. Rain mixes with CO2 in the atmosphere making carbonic acid.

Roe+

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Originally Posted by Roe+

Try using steel screws in an aluminium boat. Rainwater is acidic = electrolyte. Rain mixes with CO2 in the atmosphere making carbonic acid.

Roe+

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We are talking about guns here , Winchester going back to pre 64 , has used aluminum in their model 70 featherweight rifle even back then . The trigger guard and magazine floor plate were/are made of aluminum and are attached to the receiver using steel bolts and are still around to this day .

Browning shotguns , their "Citori" over and under has an aluminum receiver , I have one here .
Benelli , Beretta , Franchi , semi autos all have aluminum receivers .

There are a lot of steel screws in my aluminum boat, but they are stainless, so it's not a problem.

I think the problem with steel/aluminum corrosion requires moisture and quite a bit of time.

I have a late '70's Winchester auto and a late '90's browning auto. No aluminum / steel corrosion on them... and they get cleaned once a year, when I put them away.

My Beretta doesn't, it's German silver.

Roe+

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Originally Posted by werner.reiche

There are a lot of steel screws in my aluminum boat, but they are stainless, so it's not a problem.

I think the problem with steel/aluminum corrosion requires moisture and quite a bit of time.

I have a late '70's Winchester auto and a late '90's browning auto. No aluminum / steel corrosion on them... and they get cleaned once a year, when I put them away.

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You're sure they're aluminium? If you're waterfowling or doing hunting in the rain, there's your moisture as well as when you bring a cold gun indoors - condensation.

Roe+

When stainless and aluminum are in contact in the presence of an electrolyte it is actually the aluminum that corrodes. That being said there are many instances of guns/boats/trailers etc where aluminum and stainless are used together successfully. This is because the manufacturers for the most part understand the chemistry and do one of several things to mitigate the problem such as electroplating one of the metals with a 7-10 micron thick layer of zinc/nickel or other metal to prevent the problem or they use gaskets to prevent contact.

This is hijacking the thread but , just google when aluminum was used in car engines ? or go to this link;http://www.aluminiumleader.com/en/around/transport/cars

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Originally Posted by Species8472

When stainless and aluminum are in contact in the presence of an electrolyte it is actually the aluminum that corrodes. That being said there are many instances of guns/boats/trailers etc where aluminum and stainless are used together successfully. This is because the manufacturers for the most part understand the chemistry and do one of several things to mitigate the problem such as electroplating one of the metals with a 7-10 micron thick layer of zinc/nickel or other metal to prevent the problem or they use gaskets to prevent contact.

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We all realize that and know that galvanic corrosion takes place no one is disputing that fact.

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Originally Posted by Roe+

You're sure they're aluminium? If you're waterfowling or doing hunting in the rain, there's your moisture as well as when you bring a cold gun indoors - condensation.

Roe+

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The receivers? I can't find a reference for the Winchester, but the browning is:

http://www.nramuseum.org/media/364908/Feb%2002.pdf