This is a traditional process that is still used on high-dollar custom rifles and shotguns. Use the steel wire to suspend the parts into the boiling water (do I need to tell you to be careful?). This will usually be 2-4 times. by Keith Wood - This is where I ran into some trouble: Many sources (including the instructions on one of the solutions) tell you to use distilled water for the boiling. When satisfied, you can apply oil, wax, lacquer or boiled linseed oil to seal the metal pores. Friday, August 31, 2012. Firstly it should allow a controlled and dense corrosion to occur. Slow Rust Bluing Slow rust bluing is a process where ferric oxide (Fe2O3) is converted to ferrous oxide (Fe3O4) by boiling in hot water. After three or so hours, re-coat the steel with solution. I'm really glad to learn a new method for this, and to see that somebody's got the stones to commit some really nice steel to the process. When a fine layer of reddish-brown rust has formed (looks like reddish-brown fuzz), remove the metal, boil for 15 minutes in deionized distilled water or steam for 10 min. The EquipmentSetups can vary from the Spartan to the elaborate but basically you need (all of this is available from Brownells): - A heat source capable of boiling water- Rust bluing solution- A fine wire brush, wire wheel, or steel wool- Sandpaper (if polishing is needed)- A degreasing agent- Vinyl, cloth, or rubber gloves- Cotton balls or patches- A container for boiling water large enough to accommodate the parts that you wish to blue- Mild steel wire- Clean water. Beading means there is still oil on the surface. Wearing gloves, I boiled the steel in detergent and then swabbed it in acetone. But just for gun parts and not cigars! The excess rust is removed and the process is repeated until the desired finish is required. I've done a rust bluing job on a cheap tomahawk (using Hydrogen Peroxide and salt water), but it didn't turn out nearly as well, to say the least. You can even coat the inside of the bore with it. Wait 6-12 hours for the rust to form. A shower can be used by hanging the metal from the shower curtain rod and suspending it over a tub of water. I bought several gallons of the Crystal brand of distilled water and boiled, and boiled and boiled. Don’t leave it more than 8 hrs or you could get pitting. Use silicon carbide paper up to 320 grit to prepare the steel. Larger parts such as barrels can be boiled in special tanks available from Brownells or you can make a steam pipe apparatus** from PVC pipe and fittings obtained from a local home improvement store. Even small traces of oil can tinge your metal with yellow. Add 7.5 grams of sodium nitrate, the oxidizing accelerator, for every 100 liters of water. Remember that oil can seep out of receiver threads, crew holes, etc. In some climates, you may need to use a “sweat box” or hang the steel in a bathroom. Each of these cycles is called a “pass”. Before you immerse the metal, its surface must be perfectly clean. Coating the clean parts with a rust bluing solution, allowing it to rust, and boiling it in clean water converts the rust from ferrous oxide to ferric oxide. As we found out a while back, charcoal bluing isn’t as easy as it is often advertised to be—so how tough it is to rust blue steel at home? You don’t want any oil on it! Always mix the solution outdoors. A high polish is not required because the acids in the bluing solution will etch the metal surface to … Use long even strokes with the barest of overlap. **If you build the steam pipe apparatus, a barreled action can be suspended inside the pipe, then covered and allowed to rust using it as a damp cabinet. The metal is then allowed to rust for about three hours—this is going to depend on factors such as humidity. Rust bluing gives a blue-black protective finish to metals. I could not get the red rust to turn black. The TestInstead of ruining a serviceable firearm, I decided to start with a bar of 4140 steel to test both the process and my abilities. Slow rust bluing is still used today on … Rust bluing gives a blue-black protective finish to metals. The only way to achieve a unified rust is to rust metals that are the same. Find a source of water that works for you but don’t be afraid to experiment with different sources to find the right one. Squeeze out the swab so it is damp but not dripping. If you have any questions, do not proceed until you have consulted the chemical supplier or other expert. After the metal has dried, apply the bluing solution to cold metal with a 100% cotton swab. The first step was to degrease the steel and my wire brush—any traces of oil or grease will show up on the final finish. Once the 45 minutes is up, completely immerse the metal for three minutes in unheated water. A coat of red rust will form, and for once in your life this is a good thing. All you need is a 3-4 ft length of cellular core PVC (used for sewer pipe), a flat-lidded pot, wooden dowel, 3 in toilet flange and a gas burner. Mixing chemicals can be dangerous. Add the phosphate, as directed by the supplier. Re-coat, let dry, heat metal above 100 F and put in a damp cabinet* for 4-6 hours to rust, or overnight if a damp cabinet is not available and local humidity levels are above 30%. To prepare the phosphate dipping solution, fill a tank with water until 6 inches below the maximum fill level. Just place the vaporizer in the box, vent the top and steam for 30-45 minutes or until you get a ripe rust. Slow rust bluing requires the solution to touch the bare metal surface of the firearm parts and will not penetrate a film of oil or old bluing which would cause a patchy undesirable finish. Also, be advised that different types of steel allow will rust in slightly different colors. It removes easily when you are through with lacquer thinner. Cover the top with a towel or aluminum foil and steam for 10 minutes. The chemical recipe used to rust blue has two requirements. Boil tap water in the pot, place the pipe over the flange and hang the barrel/barreled action from the dowel. Always know which chemicals you are mixing and what reactions they will cause. Rinse thoroughly with hot water. After the metal has dried, apply the bluing solution to cold metal with a 100% cotton swab. General rust blueing instructions (individual products may vary): Complete directions for the steam pipe come with each order. Slow rust bluing is basically browning the gun and than boiling it in hot water. Look for “sheeting” of the water on the steel and no beading. Heat the solution until it is between 179.6 degrees Fahrenheit and 190.4 degrees Fahrenheit. But if you desire added protection, spray any parts you don’t want to rust with clear lacquer. I ended up using Laurel Mountain Brown & Degreaser Solution as it contains its own degreasing agent and has a reputation for ease of use. You may need to use a commercial rust remover to assist in de-rusting heavily corroded parts. The word carding means to scrub off the loose oxide. Once the solution is complete, immerse the metal in the heated solution for 45 minutes. For small parts, placing them in a covered pot with a small amount of water in the bottom does the trick. Repeat as many times as you need to get the color you want. Going back over missed areas can actually remove previous color, so avoid doing that.Allow it to dry for 2 hours (this primes the metal). Add more water until you reach the fill level. Place the parts in the pipe over cold water and use it as a damp cabinet to hasten rusting. * Damp cabinet/dry heater – A damp cabinet is any box or container that has a source of moisture in it. Simply place a source of moisture in the bottom (a wet towel works well as does a pan of water) and hang your work on the cross bar. Finally, a gunsmith online suggested that I try a different water source. If you use a sweat box and low pressure steam ripening can occur with in an hour. But if you desire added protection, spray any parts you don’t want to rust with clear lacquer.
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