), 7 years ago For one thing, the source "ehow" article (which links to another site) is to say the least questionable ("Jane Smith" - seriously?!?!) This has been a method of protecting Ferrous metals for years. it may light on fire but should also quickly burn out. For example, one method suggested mixing vinegar and bleach together. on Introduction. Since the green pail was still usable, but not the galvanized metal I wanted, I decided to paint it to look like it was. Simple, neat, very nice. Another method suggested mixing vinegar and hydrogen peroxide. 4. light torch and adjust flame to something manageable Make sure that you pour enough oil so that your part(s) can be completely submerged Some kits include rubber gloves and others do not. I don't know if it's possible to get a nice mottled look on galvanized steel quickly, but you could test ferric chloride or patina made for zinc => Regards, Ted Mooney, P.E. 2. wear safety gear and bring fire extinguisher outside with you...just in case The purpose of galvanizing is to stop steel from rusting; so you should use plain ungalvanized steel if you want rust. February 2, 2012. Buff the galvanized steel with an abrasive pad or fine sandpaper to remove the galvanized coating, and draw the design onto the metal. You might also use steel wool or a scotch brite if you need a little more abrasion. It is metal… but not exactly what I was looking for. It is due to the zinc coating on the galvanized pipes and the manufacturing process. Mixing these together creates peracetic acid which, again, you don’t want to do. Remove the pipe from the solution with stainless-steel tongs not coated with rubber and dry it with a soft cloth. Reply 5. submerse a part completely in the oil and retrieve with pliers Each kit is different, so read the manufacturer's instructions carefully. check out this great ehow article--which is where I learned a lot of this process! Hot black oxide for stainless steel is a mixture of caustic, oxidizing, and sulfur salts. The finish is a beautiful semi-glossy black and no signs of rust yet. A less common environment for galvanized steel is submerged in or exposed to water. Its actually called "oil blueing" and is a way of protecting the steel from rust and corrosion, I have most often seen it used in the manufacture of firearms. We wanted it to look aged. Question 6 years ago 4 years ago. Will used oil work? Some kits include tongs while others do not. 9. repeat process 2 or three times per part to achieve desired finish I have been looking for a simple blackening process for nickel and will try this when I have a torch handy. Stainless steel. Pipes are utilized in deliver gas and water, so no matter houses or construction needs pipes equally. References: Alkyd and oil-based paints may seem to stick at first, but the oily layer eventually "sheds" the paint. Do not rub the surface with steel wool to give it a flat, muted finish. Expert welders suggest that hot-dipped galvanized metal produces more fumes and is more difficult to weld than sprayed-on galvanized metal. Let the primer dry completely, which should take anywhere from 2-6 hours, so your paint will stick properly. Probably won't ignite, but will leave divots and depressions in the 'burnt' areas. Thank you. Mix enough solution to where the galvanized pipe can be completely submerged. I do not think the amount of carbon present will be the issue, it is more likely that the used oil has more impurities in it which could result in a lesser appealing surface finish. I'm making a Tsuba and a couple of seppa for katana I've been making. Did you make this project? Galvanized pipe is coated in a layer of zinc. do not be alarmed unless flames grow It will feel oily for a few days, but it will be safe to handle after 24 hours. Share it with us! Over time, the paint starts to peel and chip away. I used lemon steel wool scrubs as my store didn’t have plain. To remove the shiny, new look from galvanized metal, submerge the metal item in a plastic tub or bucket full of white vinegar. The oil coating your part will ignite but will burn out soon. on Step 2. So sorry, and trying to be polite, but this is actually a pretty terrible method for oil-blackening/coating steel. The most common method of zinc coating is the hot-dip process. As a result, black steel pipes are more commonly used to transport substances like oil and gas rather than water. I laid out two so that I could separate finished from unfinished. I am putting galvanized steel on my entryway ceiling. Early this morning it … heavy leather gloves, jacket (welding attire works great), and safety glasses, metal or glass bowl (preferably one you don't care about). 7 years ago Galvanized metal is difficult to paint because it's coated with a layer of oil to prevent white rust. The pipe must be thoroughly cleaned before using the kit. old. If the kit does not include a swab cloth, they are available at hardware stores. Reply If you have a kitchen, then you probably already have this handy solution. Then it will need tempering as well which adds a quality known as toughness or notch toughness to the blade. Black steel is even less expensive than galvanized steel because it isn't coated or alloyed. Especially when there is a much simpler, safer, and reliable method: use an oven. Step 1: Prepare Metal Using acetone and a clean rag, wipe off excess oil, rust, etc off of your metal parts. So yes you can melt a galvanized nail. Cooling can be done in one of several ways: Immerse the steel in a passivation solution such as potassium hydroxide. Author: Dunbar (KY) I see this mixing of materials all the time in gas lines in my area. 11. wipe off with clean dry rag Adding patinas to Galvanized Steel is Easy! I have annotated them for clarification. If you're making a knife blade like I am, that's something to consider. Plastic bucket (if not supplied with the kit), Stainless steel tongs not coated with rubber. Rub the surface of the pipe with steel wool to give it a metallic, shinier finish. NEVER use water or a water based for extinguisher. 1. set up workspace. Scraping old paint from galvanized steel is quick and easy with a plastic or wooden scraper. 2 years ago As a result galvanized pipe is more durable. It’s exciting to get to share this with you today – I did a comparison test for us, so you can determine which method you prefer. I've needed to do blackened steel to protect these parts but the vinegar and bleach mixture I've been trying to do just isn't working in the seppa. You might also use steel wool or a scotch brite if you need a little more abrasion. Do not submerge the pipe in the solution for more than three minutes. This is a great instructable but I must point out that it would be far better to have some sand to extinguish any fire or soak any spilt oil. I recently did work for a doctor where his mother's house had to have sections of galvanized removed from the gas line and replaced with black iron. I would filter the used oil first to get rid of any larger particles. Galvanized metal is widely used in the building outdoor structures. The pipe must be thoroughly cleaned before using the kit. Zinc melts at 787.1 F and steel melts at roughly 1200 F depending on the quality of the steel. This is pretty slick. All you have to do is simply apply the vinegar to a clean rag and then wipe down the galvanized surface. No clue why. Put on rubber gloves to protect your skin from making contact with the black oxide. There are two ways to blacken galvanized pipe: Remove or chemically alter the layer of zinc. Moisture is highly corrosive to most metals including steel and zinc. Acetone is a pretty nasty solvent. I had my first exposure to metal-finishing when I was 14 yrs. But I feel like it should be mentioned that you MUST wipe off any oil and reheat the metal after you have repeatedly quenched it, or it will become brittle. Galvanized metal is usually zink or iron with a coating of steal sealed over it to prevent it from rusting. The weather is not because n our side this year but thought I would give your process a shot rain or shine. (I know, I'm a professional knifemaker and also make a lot of my own tooling - and put extremely hot (1,600°F) steel objects in oil regularly - and can still count to 10 on my hands, and see with both eyes.) I just wanted to mention that this may seem like a hardening process that would lead to the piece becoming brittle but it wont.Two reasons for this....1. More importantly, dousing a part in oil and then hitting it with a flame is not a great idea, let alone a good controllable process. Recycling steel … on Introduction. If you don't have any or choose not to wear gloves, be sure to thoroughly wash hands after this process. This will allow the steel to keep a good edge and the blade won't snap at the first impact.Since the OP is likely using sheet steel for this, my guess would be A36 or equivalent there is simply not enough carbon to form very much of the boundary martensite that causes brittleness.As far as the added carbon that makes up the bluing and prevents rust adding enough additional carbon to allow for embrittlement, the temp is too low, the time exposed to the oil is too short.I am of course making some assumptions here about materials but other than that the science is clear. Add the section of galvanized pipe to the bucket. The fact that oil is used as the quench means that the process of cooling is slowed significantly, again making the quench more akin to tempering.The knife you are making will need to first be hardened requiring a cherry red or even towards a straw yellow color prior to quenching depending on the mill spec. The hot-dip process consists of submerging the carbon steel into a molten zinc bath (approximately 680 degrees Fahrenheit). Comparing costs of black steel pipes and galvanized steel pipes In general, black steel pipes are cheaper than galvanized pipes. The water should be between 65 and 85 degrees Fahrenheit. It blackens 300 and 400 series and the precipitation-hardened 17-4 PH stainless steel alloys. My name is Bill Worden. I know this is an old post, and I hesitated to comment. on Step 2. Galvanized fittings also cost more than the fittings used on black steel … Immerse the steel in water. Black steel pipes, galvanized steel pipes and welded steel pipe are all widely used steel pipes. (1968) My Chemistry teacher showed me how to silver-plate a copper penny without heat or electricity. Hopefully you can get an idea of the setup from the photos in this step. 2. I started last night about 6pm. well galvanized metal is nothing more than zinc coated steel. 8. retrieve the part once again with the pliers. If you want an even finish, you should drop and retrieve each time The secret to painting galvanized steel is white vinegar. How to Clean Galvanized Metal of Peeling Old Paint. Some kits contain everything you need while others contain just the black-oxide solution. Let the pipe sit in the solution until it reaches the desired color of black. Per the instructions of heating it to a reddish color, the temperature reached at a dull red is low enough that this is more of a tempering process than anything else. Dip a swab cloth into the penetrating sealant and liberally rub it on the surface of the pipe. 6. hold part over flame, moving slowly as to evenly burn off the oil. It really depends on your bowl and your part. note that during this part you will drip oil on/around the torch. Actually ended up working really well using a plain propane torch (didn't even get the steel red hot). Despite the difficulty of predicting corrosion, hot-dip galvanizing steel is one of the best methods of corrosion protection for submersed applications because of its complete, uniform coverage. dropping the part and retrieving with pliers may seem unnecessary, but if you hold onto the part the whole time with the pliers, you will end up not blackening the bit clamped between the pliers. This zinc oxide coating serves as a critical barrier that helps to protect the underlying steel from corrosion, oxidation and other damage from the elements. Kemmett has worked in various fine-dining restaurants throughout his career and holds an Associate of Applied Science in Le Cordon Bleu culinary arts from the Cooking and Hospitality Institute of Chicago. 3. pour motor oil into bowl, about 2 cups were more than enough for me. To paint galvanized steel, start by applying a latex-based primer evenly across the surface to stop the paint from soaking into it. Add one part black-oxide concentrate to nine parts distilled water in a large plastic bucket. 7. when oil has burned off and your part is a reddish color, drop it in the bowl of oil, or "quench" it in oil. lay out rags to place your parts. Both black steel pipe and galvanized pipe are made of steel, however, galvanized pipe has a zinc coating while black pipe does not. This is not only not a great method, it is actually potentially dangerous. Some kits contain everything you need while others contain just the black-oxide solution. White vinegar is both effective and non-toxic, so it is much safer to use than your average industrial solvent. Galvanized metal is a form of steel that has been thinly coated in zinc oxide. on Introduction. 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