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#1
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Stainless steel rivets in aluminum gunnels?
I want to bag out a canoe with aluminum gunnels and I am thinking of using
marine grade stainless steel rivets. I have some hazy memories form school that different metals, next to each other can cause corrosion, especially if there is salt water about. Does anyone know whether it is OK to use steel rivets in aluminum? C. |
#2
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C. O. Rhodes wrote:
I want to bag out a canoe with aluminum gunnels and I am thinking of using marine grade stainless steel rivets. I have some hazy memories form school that different metals, next to each other can cause corrosion, especially if there is salt water about. Does anyone know whether it is OK to use steel rivets in aluminum? It probably depends on the type of stainless in the rivets. If you're talking about off the shelf pop rivets, I would expect there to be a corrosion problem. |
#3
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C. O. Rhodes wrote:
I want to bag out a canoe with aluminum gunnels and I am thinking of using marine grade stainless steel rivets. I have some hazy memories form school that different metals, next to each other can cause corrosion, especially if there is salt water about. Does anyone know whether it is OK to use steel rivets in aluminum? C. Stainless and aluminum are very similar metals, neither contain more than trace amounts of carbon, and they won't encourage corrosion when mated together. There are two groups of stainless steels, 313 series and 400 series, and any rivets you purchase that state "Stainless" should work fine. Just don't use plated carbon-based rivets. Even chrome plating will deteriorate under salt water attack. btw, I'm new here. Name's Bill, and I'm pleased to meet you. |
#4
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Kayak Bill wrote in
: C. O. Rhodes wrote: I want to bag out a canoe with aluminum gunnels and I am thinking of using marine grade stainless steel rivets. I have some hazy memories form school that different metals, next to each other can cause corrosion, especially if there is salt water about. Does anyone know whether it is OK to use steel rivets in aluminum? C. Stainless and aluminum are very similar metals, neither contain more than trace amounts of carbon, and they won't encourage corrosion when mated together. There are two groups of stainless steels, 313 series and 400 series, and any rivets you purchase that state "Stainless" should work fine. Just don't use plated carbon-based rivets. Even chrome plating will deteriorate under salt water attack. btw, I'm new here. Name's Bill, and I'm pleased to meet you. Welcome to the group Bill. Good first contribution. |
#5
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On Sun, 5 Jun 2005 18:38:53 +0100, "C. O. Rhodes" wrote:
I want to bag out a canoe with aluminum gunnels and I am thinking of using marine grade stainless steel rivets. I have some hazy memories form school that different metals, next to each other can cause corrosion, especially if there is salt water about. Does anyone know whether it is OK to use steel rivets in aluminum? C. Stainless against aluminum can cause corrosion of the aluminum to varying degrees (almost none to icky). Results will vary depending on alloy choices and environment. Don't depend on anodized aluminum preventing corrosion problems. The rivet can easily ding the anodization coating during installation. The corrosion potential between stainless and aluminum is around 0.2 V to 0.5 V depending on the grades of stainless and aluminum used. Marine grade stainless is generally 316 which will cause the most corrosion of the various stainless families to aluminum. Have you considered using 5000-series aluminum rivets with aluminum mandrels? 5000-series aluminum has excellent corrosion resistance as compared to other aluminum alloys. It will also have a corrosion potential very close to the aluminum gunnels. Another information resource may be a canoe manufacturer like Winonah. Winonah uses rivets on aluminum tubing for attaching their seat structures. Email them for their suggestion. The above info can be found in standard corrosion potential (galvanic series) tables for flowing sea water. http://www.corrosionsource.com/handbook/galv_series.htm You want the corrosion potentials to be close to each other to reduce corrosion problems due to galvanic corrosion. Some people mistakenly use the emf series tables which gives a very different picture of metal compatibilities. --- Mark |
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