An option is to do the job in such a manner as it lasts 15-20 years and looks brand new. This high-strength brazing rod allows you to repair or fabricate aluminum stronger than a TIG welding machine, without the machine. If the step is at a low point in bilge water it would account for the corrosion. Instead I created a plug with fiberglass sheets I had leftover from cutting out portholes. Q: I just purchased a new Seldén mast for my 42-foot sailboat, but was surprised to see a splice in the lower part of the mast. 1) Cut the 1/2' off  at the base and add 1/2" G10 plate to ensure the mast section that meets the partners stays at the the same location. OEM-approved paint is color matched to every wheel prior to repair. Clean off … The chemical conversion will react with the aluminum surface, providing protection against corrosion. A number of methods are used to stop the corroding effects of these salts. Poultice Corrosion. 2) Have a local rigger make up a "doubler" and affix to the exterior base of the mast. I also have scratches on my mast. I like the G10 base plate. 1) Cut the 1/2' off at the base and add 1/2" G10 plate to ensure the mast section that meets the partners stays at the the same location. The manufacturers even want us to build special clean rooms for aluminum repair at a cost of about 60-80 grand. Aluminum corrosion could however be a serious issue. Sign up for a new account in our community. The material is about 3/16" thick. Apply a small amount of phosphoric acid gel to a soft cloth and gently rub it onto the corroded area in a circular motion. Electrolysis occurs with two dissimilar metals are in an electrolyte. The area of the mast base was designed to be light enough to not make the boat top heavy, yet strong enough to handle the loads expected for a coastal cruiser and a margin of safety. Wipe it off with a dry cloth, but do not continue to rub it in. Most cities will have an anodizing facility, but anodizing requires that the mast be immersed in an acid-electrolyte bath, and not all of them will have a tank to fit a mast. Corrosion. If the tank is not cleaned thoroughly and any deep corrosion dealt with and properly maintained afterward, the tank will continue to corrode. Re: Aluminum mast corrosion repair. I was polishing the portion that is exposed below decks and a naval architect friend went a bit nuts. Unpainted masts are protected from corrosion through anodizing, an electrochemical process that converts the metal into a shiny, anodic oxide finish. Examples include anything from a stainless steel bolt threaded directly into an aluminum mast regularly doused in saltwater, to a bronze propeller on a stainless steel shaft immersed in seawater. It looks like a 1960s mast, and many of them are like that now. *!Looking for experience and/or advice on best way to paint a 34 year old aluminum mast while out of the boat and on horses. I had to trim the spar on my Columbia 43 - a couple of inches IIRC. usa1136, October 19, 2020 in Fix It Anarchy. Will this not change the characteristic and bend of the mast? YES! First we need to understand that all corrosion except mechanical erosion is electro-chemical in nature. Corrosion. The Aluminum Association last year produced a handy guide to the three dominant corrosion phenomena found in in automotive applications: crevice corrosion, filiform corrosion and galvanic corrosion. Specializing in high-quality aluminum spars for your boat. The following story is about corrosion above deck between the aluminium mast/boom and the stainless fittings for the gooseneck, linking them together. You guys are a kick in the butt. I just saw a 14 and 15 dodge caravan with aluminum hoods that were corroded already on the outside. I would not use SS wire wheel to remove the corrosion; Reason is that the soft Aluminum will fold over and bury the corrosion. Allow the gel to sit on the area for about 10 minutes. The differences between the types of corrosion we experience on our boats has to do with how the corrosion occurs and how quickly the metal is compromised. It's the smart choice. The Strongest, Fastest, and Easiest Aluminum Fabrication or Parts Repair. Marine Aluminum is chosen to be corrosion resistant, but corrosion can still cause damage. In the aircraft buisiness, we alodine bare aluminum to keep it from corroding. You should also consider the grade or series of aluminum you’re using. If corrosion and fatigue establish a foothold, it’s only a matter of time before something as small as a corroded clevis pin or a cracked turnbuckle could easily cause your … Will it work for your job? It’s like a Laser mast. Alodine when applied to the surface will identify any remaining Corrosion by turning it black. I have significant corrosion at the base of my aluminum J105 mast. Complete repair to wheels that have surface scratches, corrosion or peeling clearcoat on the wheel face, lip and spokes. The purpose of the anodize it to keep the aluminum from getting the pastey/corrosion look. I cut the flanges off the foot, which caused the corrosion in the first place. Aluminum Corrosion Galvanic Action on Morse Control ? Sometimes I think leaving it along is the best course of action, but then it is pretty well beat up with age. Mast Extrusions and Fittings Boom Extrusions and Fittings Round Tubing Sailboat Hardware and Accessories Standing Rigging and Rigging Kits Pricing and Terms Abrasive Waterjet Technology Company and Contact Information Paste that Stops Corrosion Between SS and Aluminum . Sand blast, Sand paper, or 3M Scotch Brite Disks. RIP. Privacy Guaranteed - your email is never shared with anyone, opt out any time. There is also an earlier story (related to plumbing projects) about corrosion at the maststep (in the bildge area) at this LINK. Is the splice detrimental to the overall strength of the mast? Getting it all up a bit would be a good long term fix. In both situations — and dozens more on boats — dissimilar metals in a common electrolyte create a battery with an anode and a cathode. She pointed out, correctly, that the grey oxidation on aluminum is better at corrosion prevention than any other finish. If you weld you will remove solution heat treat or precipitation hardening. Oxidation and corrosion are very similar, and the biggest difference is The corrosion is at the worst point: the base, which is the point of maximum compression load. 1. It is in excellent condition. Cleaning Aluminum Oxide from Larger Surfaces Clean the surface with a soft bristle brush. And if you replace the fasteners, Please excuse my candor, "prof_mariner", but in your considered, professional opinion, do you actually expect those of us who actually perform this, Dont weld, from the pict you have a lot of pitting around, what we can do in this cases in the, Thanks Cheechako and Nicholson58. The high corrosion resistance found on aluminum, nevertheless, is due to the presence of a thin, compact film of adherent aluminum oxide on the surface. aluminum mast and boom that we keep down on the Texas gulf coast. I'm also concerned that #2 might not fit in the partners when re-stepping the mast. Spray the coating with fresh water to rinse off the excess. A: Aluminum is a reactive metal (unnoble) which should have a low corrosion resistance, according to thermodynamics. My 1980's vintage Isomat aluminum mast has areas of corrosion where stainless fittings were mounted without isolating the fitting from galvanic corrosion. This is a critical point. Unlike steel, aluminum resists corrosion by moisture and air when exposed to the elements, but salt spray and road salts can cause a condition caused oxidation, which discolors the aluminum surface. “Of course you don’t need a new mast. It’s an ex-mast. If you are taking the rig out anyway, I like the G10 option. I am not sure it's that important to re-anodized/alodine the aluminum. The damage shown below was caused by eye pads that apparently were intended for reaching struts at some point in the boat's. Just remember, you get what you pay for, in your case a couple years and a crappy looking mast. I have significant corrosion at the base of my aluminum J105 mast. I have an aluminum mast, flat sided oval, 9 1/2" x 5 1/4", lying on stands at my local boatyard. Tim The bending happens between the deck and the tip of the mast. Over the years, the salt air has led to corrosion pitting in the aluminum under the … Wheels are removed from the vehicle, cleaned, repaired, primed, painted and clearcoated using patented paint adhesion technology. It's easy! 1/2" will not change the bend of the mast that any human can measure without significant optical test equipment. By Q: Why does corrosion occur between anodized aluminum and steel? Powered by vBulletin® Version 3.8.8 Beta 1. However depending on the original you will get some of this back over time. Minimize or mitigate the effect of galvanic corrosion. Location: Southwestern Yacht Club, San Diego, CA. I used Perfection and painted the entire mast. You guys are a kick in the butt. That’s dangerous. 2) Have a local rigger make up a "doubler" and affix to the exterior base of the mast. Corrosion around the gooseneck. Aluminum is a metal that is used for many household products, including deck and porch railings, light fixtures and outdoor furniture. On a smaller mast, I had a welder heliarc patches on the holes. The question about wood or aluminum, under the mast needing repair … Weld lines around the spar section work like knifes, in your case its the ss pads under the boom i guess to fit reef lines and the area is not really big in size , check some zspar inmast furling spars, they got some wide windows in bot sides of the furling drum without compromise the mast, but in this case the internal structure is diferent , best solution for this pad areas in my mind is to fabricate a wider aluminium pad ,thin enough to bend it and use monel rivets if you fear ss screws again in the pad, and for the ss fitting use the same previous holes in the area, we fix dozen of corrosion and cracked problems with aluminium sheaves and spar curvature sections , even for a severe corroded mast feet, boom goosenecks or spreaders base,,,. Are you sure that the corrosion stops at 1/2 inch from the base? W. Evert, Charlotte, NC. Corrosion in saltwater is a major problem, but even freshwater boats can suffer from corrosion. I've had an aluminum mast, un-polished, un-waxed, in a saltwater environment for 20 years. The areas where the patches are going is flat. Any other options and or suggestions? Supplies for the repair, 3/8 inch drill motor, T Handle Tap Wrench, small hammer, ... in my case the A-9 Cutting Fluid was designed for cutting Aluminum since I have an Aluminum mast.. ... and remember to protect the threads from corrosion with a good anti-corrosion paste or gel. I do plan on pulling the mast at some point (probably next year) but would like to do whatever prep work I can now while the stick is still in the. Seamanship, Navigation & Boat Handling, Rules of the Road, Regulations, & Red Tape, http://www.jamestowndistributors.com...t.do?docId=542. Painted and repaired mast step I cut a hole and inserted a 1.5″ aluminum tube as conduit for wiring. Part Number. Among other attributes, marine-grade aluminum alloys, those in the 5000 and 6000 series, are naturally corrosion resistant. There is, however, an aesthetic price for this durability. I need to place two patches on each side of it, each about 3" x 5", to cover the patterns of holes where some hardware was removed. I also had to replace the rotted mast step so I simply made it 2" thicker. Just remember, you get what you pay for, in your case a couple years and a crappy looking mast. thought I was going to have to do the same but after blasting the base of the mast on my 105 it cleaned up nicely and nothing was needed, You need to be a member in order to leave a comment. Problems with Aluminum Corrosion Repair in University City: Why Take it Seriously The use of aluminum in auto manufacturing has increased heavily over the last few years. If there’s any possibility of it happening you have two options: Apply a protective coating. From what I gather, there are two repair options. Navigate pages of this story. #1 seems much more simple and less expensive. Please support our sponsors and let them know you heard about their products on Cruisers Forums. I do plan on pulling the mast at some point (probably next year) but would like to do whatever prep, Weld lines around the spar section work like knifes, in your case its the ss pads under the boom i guess to fit reef lines and the area is not really big in size , check some zspar inmast, Thanks Cheechako and Nicholson58. Nobody has ever replaced a mast on an Oyster!” That’s what we were told over and over again, by rigger after rigger and surveyor after surveyor. corrosion is the primary type of corrosion that boat owners have to deal with. From what I gather, there are two repair options. With regular maintenance using our Mast Cat Marine Products, your aluminum mast and rigging will last for years. When exposed to air, oxygenated seawater, or fresh water, aluminum quickly develops a tough, transparent oxide film that is resistant to corrosion. I expected a one-piece extrusion. T he majority of fuel tanks, especially on yachts, are very dirty by the time filters start to clog and a problem is noticed.. Spray or brush on two or three thin, light coats of regular primer, primer that binds the substrate and provides mechanical adhesion by settling into scratches on the surface of the mast. Aluminum also corrodes just like steel so there isn’t a real advantage there. I used the Chromate primer and re-painted. But here we are, many months later, with our brand new mast gleaming in the sunlight. No welding aluminum needed! This is just as true of a drop of water on a piece of raw steel, as it is of a … Seems like it would be easy to remove a bit and add a doubler under the step. 1. Daysailing, local cruising and working on them. 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