This is why many manufacturers have switched to other coatings that have greater durability. Electroplating remains more common than the high-tech coatings that were only recently developed. If cost is an issue, galvanized fasteners tend to cost less than coated ones while offering nearly as much corrosion resistance. One type of corrosion process is known as the two-metal reaction. The presence of moisture allows an electrical connection between the two different metals, causing an exchange that leaves one of them weak and pitted.
Using the same metal for all the parts of your project eliminates this problem entirely. Since there's no coating, scratches don't lead to corrosion either. Yet aluminum is not always the best fastener material either. It doesn't offer the same strength when it comes to shearing resistance, and this is often the determining factor in choosing a fastener for a project like an airplane or a commuter train.
Aluminum fasteners are usually limited to less heavy-duty uses. Finally, fasteners made from the various high-strength plastics available today are also an option for preventing aluminum corrosion. Cookies that the site cannot function properly without. This includes cookies for access to secure areas and CSRF security. Craft's default cookies do not collect IP addresses. Name : CraftSessionId. Description : Craft relies on PHP sessions to maintain sessions across web requests.
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Joined Aug 5, Messages Stainless is great. Use antisieze liberally if you plan on disasembly. Aluminum is fine. Depending on the application, you might be ok with zinc plated steel. Of course there will be corrosion but is that really unacceptable? The amount of corrosion will largely depend on the environment.
I work at a machine manufacturer and we use zinc plated fasteners on aluminum all day. It's for an interior bracket. Stainless it is. Joined Sep 28, Messages 4, Location Dorset.
Stainless is worse than zinc plated steel, but Aluminum will corrode in contact with most other metals if the environment is suitable. Inside in the dry it won't matter. Joined Apr 28, Messages 14, Location oregon. I worked manufacturing where literally tons of aluminum was bolted together as well as threaded into with black oxide screws.
Never a problem. Do not use Al fasteners and I personally have had more problems with SS that anything. This was all indoor stuff not exposed to chemicals. On the heaters we used Watlow lube to prevent problems. So no stainless? Anderson Well-known member. Joined May 26, Messages Location Wisconsin.
Click to expand I've had good luck with SS. Showkey Well-known member. Anderson said:. What problems have you had with stainless bolts on aluminum? Only problem we have had is stainless bolt like to seize during install and removal.
DHCrocks Well-known member. Joined May 2, Messages 1, Location Hawaii. Aluminum boat docks are bolted with ss hardware. So are bleachers. If can stand up to that environments then it should be fine for any application.
Copper-Nickel Cu-Ni fasteners work well for this application as well. Stainless bolt, brass nut. This is for a bracket not space shuttle. I spose its not only on the internet but sheet,,,,,,,,,,,,,,,,,, where did some of you guys learn to do this work? Limited info from OP but if he's worried about galvanic corrosion, then we chime in.
We used SS bolts and nuts to secure aluminum panels to our service bodies. There is a body company in Illinois that has nylon washers with sleeves so SS bolts and washers do not come in contact with the aluminum.
The company is Sauber Manufacturing, Virgil, Illinois. Stainless is worse than zinc plated steel, Joined Oct 3, Messages Worked in the sheet metal industry for years and we used SS hardware most of the time for aluminium.
By the way the chart that Showkey posted doesn't address SS for electrolysis. Join Us! By joining you are opting in to receive e-mail. Promoting, selling, recruiting, coursework and thesis posting is forbidden.
Students Click Here. Related Projects. What would you recommend for gasketing: - between the flanges - under the bolt washers - around the bolt shanks The bolts are nominally loaded. Hi quiry13, My suggestion would be to gasket the 2 flanges and use stainless steel fasteners.
Would it be practical to coat the joint with marine grease or a suitable product? Best of luck. In the old days we used to coat the areas with primer followed by laquer paint. Once fastened we painted it again and it worked well. Now we have epoxy. Used the same way should be terrific. Hope this works for you. Hi, SS and aluminium work very well together without galvanic corrosion.
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