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Rotax Metals

Simple Tips on How to Expedite Patination of Bronze Sheet Metal

expedite patination of bronze

Bronze is an alloy of copper and tin. Its base metal—copper—is known for its many useful properties, including corrosion resistance, malleability, and electrical conductivity. But copper has one prominent characteristic that sets it apart from other non-ferrous metals—it forms patina when exposed to oxygen.

Patina is a green or brown film that develops on the surface of copper, its alloys, and similar metals through a long period of oxidation. The patina that develops on copper starts off as pure brown and finally turns into hues of blue and green. One popular example of copper that has successfully formed patina after constant exposure to the elements is the Stature of Liberty.

This special quality of copper does not go away when it is alloyed with other metals. Therefore, bronze, is also capable of producing patina. In fact, its characteristic greenish-brown hue after many years of oxidation is a type of patina. And despite being stain by nature, it is one of the things that people love about this metal. In fact, some choose to speed up patination to achieve the elegant antique color of their bronze pieces.

If you have bronze furniture that you can’t wait to have the vintage look you’ve always desired, here’s a simple guide that you can follow.

Step # 1: Prepare the following materials—clean rag (or paper towels), container, hydrogen peroxide, rubber gloves, salt, white vinegar, and of course the bronze piece. Any kind of salt should be fine and wearing gloves is optional but recommended.

Step # 2: Rinse the metal properly. Make sure all grooves are free from dirt. If the metal is slightly oily, degrease it thoroughly until all oil is washed up. Then dry the furniture piece until there’s no trace of moisture, which might get in the way of patination, found on the metal’s surface.

Step # 3: Pour vinegar and salt into the container and soak the bronze furniture. Make sure that the furniture is completely submerged. You can expect the color of the metal’s surface to change slowly. The color of patina depends on several factors, including soak time and temperature. To intensify the oxidation, you can pour peroxide into the solution. Once you achieve the color that you want, remove the metal from the container and dry it properly.

You can do this on any kind of bronze item you want to patinate. Whether it’s a bronze sheet metal, tube, or bar, so long as you have sufficient materials and patinating agents, you can do this at home. To ensure that you will achieve high-quality patina, purchase your metal from a trusted supplier, such as Rotax Metals.

Sources:

HOT PATINA ON BRONZE, instructables.com

What Is Patina?, thebalance.com

How to Restore the Look of Your Furniture Made of Bronze Sheets and Bars

bronze furniture

Bronze furniture pieces are not to be underestimated. With proper care, they can become the center of attraction for any room in your house. If you have old pieces that are made of metal and have greenish hue, chances are those pieces are made of bronze. Whether it’s a table, a fixture, or a statue, it can be brought back to its original elegance. In fact, minor cleaning may be enough, as its antiqueness makes a perfect complement to your interior design.

Before you start cleaning and polishing your bronze furniture, however, there are several things you need to understand first. One of these is that bronze naturally forms a layer of stain called patina when exposed to oxygen. This layer is primarily due to its copper content. Copper is known for its ability to passively respond to oxidation, which is to form a layer of patina. In the case of copper, this layer is green, which is why the patina that copper forms is greenish as well. Dull green to be exact.

You also have to know that not all bronze furniture are pure bronze. Some of them are simply cladded or galvanized with bronze or covered with bronze sheets. In that case, the furniture may require a different and more careful cleaning and polishing process. One way to determine if the furniture is pure bronze or not is to weigh it. If it’s too light, there’s a chance that bronze is only skin-deep, considering that bronze is a dense and heavy material.

Step-By-Step Process

Here are the materials you need for cleaning your bronze furniture and fixtures:

  • Warm water – Make sure it’s neither too hot (to avoid peeling off the patina) nor too lukewarm (to speed up the task).
  • Clean towel – Choose a white or light-colored towel so that you can see how much dirt or stain you are removing. Also this way you can know if you’re already wiping off too much patina.
  • Small dish – It should be small enough to allow for the creation of a thick mixture of lemon juice and baking soda
  • Soft cotton polishing cloths
  • Lemon Juice
  • Baking soda

You also have the option to use vinegar, flour, and salt instead of lemon juice and baking soda. The resulting paste is just as effective in revealing the natural sheen of bronze. So this is the step-by-step process of cleaning and polishing your bronze furniture.

#1: Start by thoroughly rinsing your bronze piece with warm water. Gently remove the dust and particles that have hardened on the surface of your furniture, especially those stuck along the grooves. After rinsing, make sure to dry the furniture carefully. Moist metal is harder to polish with the solution you will apply.

#2: Prepare the polishing past by mixing baking soda and lemon juice in the small dish. Stir gently until you see the baking soda fully dissolved in the extract. You will notice bubbles or suds forming in the process. Just let them settle until you see the resulting paste. This is what you will apply and scrub on the surface of your metal piece.

#3: Rub the surface of your bronze furniture with your hands. To prevent the paste from irritating your skin, you may use rubber gloves. Make sure every surface that you are ready to scrub is applied with the paste for best results. You may also use polishing cloth to smear the paste. This is the same cloth you will use to scrub the metal.

#4: Start scrubbing the surface of your furniture with the clean cloth you used to smear the paste. Do this repeatedly until the desired effect is achieved. Make sure that the pressure you will apply is uniform across the surface for best results.

With these simple steps, you can reinstate the appearance of your bronze furniture. You can do the same with all other bronze furniture and fixtures you have in your home. Should you decide to purchase bronze materials for your future project, make sure to get them from a trusted supplier like Rotax Metals so that the furniture you’ll produce will not be difficult to polish in the future.

Sources:

How to Clean Bronze, howtocleanstuff.net

5 Best Baking Soda and Vinegar Cleaning Solutions, rd.com

Which Is a Better Method for Making a Bronze Tube, Casting or Wrought Drawing?

making bronze tubes

Bronze is an absolute favorite when it comes to making decorative fixtures. Whether you need tubes for your customized bed frame or sheets to cover your countertop, bronze is the perfect material. It’s not only an elegant-looking material, but it’s also packed with other properties that attract artisans and builders everywhere. But have you ever wondered how material supplies made of bronze are manufactured? Here’s a glimpse of the process.

There are two ways bronze can be formed into tube, bar, or sheet. One is by casting, a metalworking process in which bronze is melted, poured into mold, and allowed to cool and harden. The other is wrought drawing, which involves heating a block of bronze and working it with tools until the desired shape is achieved. Both techniques have their share of benefits, but you need to choose the one that works better for your needs. Here are some of their prominent differences.

Cost

Production cost for metalworking is based mainly on the complexity and multiplicity of the processes. Since more fabrication techniques are needed for wrought drawing bronze, the initial cost is often higher than that of cast bronze. On the other hand, the cost of making pattern is higher for cast bronze since a pattern must be made for each different cast part design. To make the casting process more efficient, production runs have to consist of many parts at a time.

Weight

Wrought drawing involves nothing more than heating prior to working the metal. The chemical change has a minimal effect on the properties of bronze, including its weight. Whereas, since casting involves melting, the resulting parts are expected to be denser and heavier. The weight increases even more as the metal goes through each heat treat cycle.

Delivery

Wrought bronze is quicker to produce than cast bronze because it doesn’t require long cooling time. In most cases, after the metal is worked and finished, it is immediately available for delivery. The only major cause of delay of wrought bronze production is downtime due to equipment failure. This same issue rarely occurs with casting since it only involves cast and mold, which don’t really need machines to work the product afterwards.

Most bronze tube, sheet, and bar suppliers use both techniques to give customers more options. However, not all of them may have the right skill, facility, and technology needed to produce high quality materials. Go to a trusted supplier like Rotax Metals to make sure that you will be able to obtain products that suit your needs.

Sources:

What’s the Difference Between Cast and Wrought Iron?, machinedesign.com

Cast vs Wrought, rolledalloys.com

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