November 19, 2017

Benefit of Anodized Aluminum

Any part that formed from aluminum metal should be anodized because the properties of origin aluminum metal will improved and change into better properties. Even of many anodized product can make more stand to corrode or stand to scratch but anodizing to aluminum is purposed to certain purpose of anodizing. The below lists are some reason why people doing anodizing to aluminum, outlined on the below:
  1. Anodizing aluminum is purposed to increase corrosion resistance. Oxide film that formed on the surface of aluminum sheet can stand to corrode in atmospheric condition and salt water attack. So this oxide film can protect underlying metal by serving as barrier from attracting some corrosive agent. To make the oxide film can protect the aluminum sheet is treated the aluminum sheet after anodized into hot water with slightly acidified, or use dichromate solution, or nickel acetate solution.
  2. Other reason to anodize aluminum improve decorative appearance. All anodic coating have lustrous and relatively good abrasion resistance. The degree of lustrous of anodic coating depends on the condition of aluminum before anodizing. Dull etching will decrease luster, bright etching, chemical or electrolytic brightening and buffing will increase luster either diffuse or spectacular. For this kind of aluminum finished are use in structural and architectural application.
  3. Aluminum anodizing can increase abrasive resistance. From the experience product result the thickness of hard anodizing about 25 micron (1mm) to more than 100 micron (4 mm). This thickness is enough for many applications that involving rotating parts where abrasion resistance is required.
  4. Some anodizing process is purposed to increase paint adhesion. Alloy metal from aluminum can anodized to activate the surface of alloy metal. Aluminum base alloy materials that are painted for service in severe corrosive environment are anodized before painting.
  5. Other reason of anodizing of aluminum alloy is improve adhesive bonding. This kind material are used in aircraft structure of most modern aircraft. Anodizing use phosphoric acid or chromic acid can improve bond strength and durability.
  6. Anodizing process also can improve lubricity, by combination of polishing or honing of hard anodizing to smoother surface before applying a polytetrafluoroethylene coating.
  7. General purpose of anodizing product is purpose for aesthetic performance, can provide unique, decorative finished color. As already discussed of mechanism of coloring in anodizing process, that sealing of anodizing aluminum is together with coloring of oxide film on the surface of aluminum. Integral anodizing, depending on the alloy composition, is used to provide a range of stable earth-tone colors suitable for architectural applications.
  8. Anodizing process also purpose to provide electrical insulation. Aluminum oxide is a dielectric, that mean can’t conduct electric current until certain voltage. The breakdown voltage of anodic film varies from a few volts to several thousand volts. This depend on the alloy properties itself and on the natural and thickness of oxide film on the surface.
  9. Anodizing of metal also make subsequent plating. The porosity of certain anodic films enhances electroplating.
  10. Anodized surface of aluminum can detect of surface flaws. Chromic acid solution bath can be used as an inspection medium for detection of fine surface cracks. When object containing surface flaws is removed from anodizing bath, then washed and dried quickly, chromic acid entrapped in the flaws seeps out and stains in the anodized coating in around of the flaws.

November 18, 2017

Hard Anodizing Aluminum

Hard anodizing aluminum is similar to standard aluminum anodizing in that are controlled by electrochemical processes. The key difference is that hard coat anodizing provides a surface more wear resistant and has a smoother and harder surface than standard anodizing. Hard anodizing aluminum will result a uniform aluminum oxide layer on the surface that penetrate the material pores. Anodizing process condition for hard anodizing involved by submersing part in sulfuric acid solution at room temperature from 20 minutes two hours. The longer time submerged determines the thickness of coating. Aluminum oxide formed in the surface during hardcoat anodizing is more uniform, dense, and much harder than the natural oxidation.

The benefit of Hard Anodizing:

The benefit of hard coat anodizing have many, some reason to create hard coat for aluminum anodizing is as follows:

  • More corrosion resistance
  • Looking better than normal aluminum
  • Use as insulator because oxide film can’t conduct electric current
  • Increase wear resistance and abrasion resistance
  • More bright can use as reflector
  • Light weight
  • Flame resistance
  • No contaminate for example in use for medical instrument

Many Hard Anodizing Aluminum Application:

Some service company and repair company use hard coat anodizing process to serve their customer to give satisfaction to their customer and create credible company for their service.

Many application can use hard coat anodized, for example as below:

  • Automotive
  • Aviation & Aerospace (mostly all frame and the furniture use aluminum anodized)
  • Buildings & Architecture (for structure frame, windows and door)
  • Electronics (for casing of electronic)
  • Food Manufacturing / Preparation Equipment (canning and keeping material and product)
  • Home Furnishing
  • General Manufacturing
  • Marine Industry
  • Medical / Dental Equipment
  • Military / Law Enforcement
  • Sporting Goods

November 16, 2017

Anodizing Condition Process

Generally anodizing process is associated with aluminum metal, but similar process of anodizing can be applied to several kind of base metal like magnesium, titanium, and zinc. Anodizing aluminum can be accomplished in wide variety of electrolytes, employing varying operation condition including concentration and composition of electrolyte. Anodizing can be process in several kind of process, that is used different anodizing bath solution, such as chromic acid process, sulfuric acid process, and oxalic acid anodizing bath. As on the table condition process of anodizing, there are two kind of anodizing process condition. For conventional anodizing and commercial anodizing process.

Bath Solution % weight Temperature, oCDuration, minVoltage, voltCurrent Density, A/dm3
Sulfuric Acid Bath101815 - 3014 - 181 - 2
Aluminate sulfuric acid bath152110 - 6012 - 161.3
Oxydal Sulfuric Acid20183012 - 161 - 2
Anodal and anoxal20185012 - 160.3
Cromic acid bath340600 - 500.3

Chromic acid, Commercial5 - 10 4030 - 600 to increasing limit controlled by amperage0.5 - 1.0
Oxalic acid, Eloxal2 - 1020 - 8030 - 8020 - 800.5 - 30
Oxalic acid, Oxal2 - 1020 -8010 - 240 601.5
Oxalic acid, Ematal1.2 - 4050 - 7030 - 401203

November 15, 2017

Galvanized Paint Price

Many kind of spray paint sold not just usual paint but some spray paint is anodized spray paint and galvanized spray paint. Galvanized paint is paint that contained of zinc on the paint compound, zinc paint coating is a simple method to coat with zinc like in galvanizing process but only by painting. There are many galvanized paint product and different price for this paint. If see on the characteristic of zinc element, this substance have 419.4 oC, can’t dilute in ordinary solvent. Zinc very soluble in hot KOH, so spray paint should be modified in order can dilute zinc in cold solution. What the quality of this paint that make some type of galvanized spray paint have different price. See galvanized paint price on the below paint product, and learn what type of this paint of every product trademark.

Many Type of Galvanized Spray Paint Sold in Online Shop of Indonesia

  • Primo Zinc Spray Paint, galvanized compound for anti corrosive, volume 400 ml. Price: Rp. 195,300 (color Dark Grey). Stand to hot until 450 oC, fast dry only 15 minutes.
  • Primo Zinc Spray Paint, galvanized compound for anti corrosive, volume 400 ml. Price Rp. 185,000 (color dark grey), use as base paint.
  • Primo Bright Spray Paint, galvanized compound for anti corrosive, volume 400 ml, Price Rp. 184,500 (color silver metallic), stand to hot until 315 oC, fast dry.
  • Karmand cold galvanized for anti corrosive, use as primer coating. Price Rp. Rp. 400,000. Karmand cold galvanized compound is a compound contain of aluminum substance, zinc and certain resin. This paint can apply to all alloy steel and hard steel, piping, steel tank, and exhaust of cars. This pain in use should be dilute in Thinner karmand CG or Thinner A special product.

Price of galvanized Spray Paint in Ebay online shop:

  • Aerosol Spray Paint Satin Gloss matt Primer Peel-able Galvanized 400. Price £ 5.85. Auto extreme (400 ml spray paint). Use as superior paint finish, color gloss satin and matt finished.
  • Action Can ZG 90 Cold Zinc Galvanizing Spray 500 ml. Price £21.45. ZG 90 cold zinc galvanizing spray paint is intended as a repair coating for newly galvanized metal that required repair or re coating to match the original finish.
  • Hammerite Direct to Galvanized metal Paint Quick Drying smooth Black, volume 750 ml. Price £17.99. Hammerite direct to galvanized metal paint is specially designed to be applied directly to galvanized metal without the need for a primer, use as paint act as both primer and topcoat in one applied.
  • Action Can ZG-90 Cold Zinc Galvanizing Paint Aerosol 500 ml. Prize £7.73. Action can cold zinc galvanizing paint. Two botton for varied spray pattern and application in exterior windy conditions.
  • Zinc Rich Galvafroid Type Cold galvanizing Paint – High Zinc Rust Inhibitor, volume 1 Ltr. Price £ 28.75
  • Metallic and Enamel for all purpose aerosol spray paint DIY Gloss Matt Primer Graffiti. Price £5.75. Aerosol Spray Paint DIY use for a superior paint finish. Paint factory with volume 200 ml spray stand to heat temperature until 600 oC.

November 10, 2017

The quality of Aluminum Affect to Anodizing result

The condition that can’t be avoided to make a best result of anodizing aluminum is the purity of aluminum metal. The purity of aluminum is an important factor in electropolishing of the aluminum metal. An appreciable increase in reflectivity can achieved only in amount of admixtures is much less satisfactory. Very often polishing becomes impossible because of the non-uniform dissolution of the surface of the anode.

This factor renders difficult the polishing of aluminum alloys, especially those containing silicon. For the treatment of castings of an aluminum alloy containing 5 per cent silicon, an electrolyte comprising 13 per cent hydro-fluoroboric acid and 52 percent glycerin is recommended. The solution is used at 25 oC with a current density of 200 amp./sq.ft., the time of polishing being 10 minutes. During polishing the solution is stirred. Bath chemicals and conditioning are very dependent on the purpose of anodizing process.

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Benefit of Anodized Aluminum

Any part that formed from aluminum metal should be anodized because the properties of origin aluminum metal will improved and change into...