Saturday, April 12, 2014

Gold Plating Application

Gold plating is a unique surface with interesting yellow color. Beside the good color gold also have good properties to cover metal surface because it stand to corrosive weather and will not oxidized by water, other good properties of gold metal have electrical conductivity stays uniform over long periods resistance, good solderability, and when alloyed with cobalt, it has very good wear resistance. Gold is commonly used in electrical switch contacts, connectors pins and barrels, and other applications where intermittent electrical contact occurs.

Gold plating specification:
  • Type 1, with 99.7 % gold minimum, hardness grade A, B or C. Gold plating used for general purpose, high reliability electrical contacts, solderability, and wire wrap connection.
  • Type II, 99.0 % gold minimum; hardness grade B, C or D, A general purpose, wear resistant gold. But this equipment will not withstand to high temperature applications because the hardening agent in the gold plating will oxidize.
  • Type III, with 99.9 % gold minimum; hardness grade A only. Gold plating for semiconductor components nuclear engineering, thermo-compression bonding, and high temperature application.
Gold plating and Gold electroplating purity and coating thickness.

Any deposit of impurities can make difficult to solder, and for this reason high purity gold plating is preferred. Soldering requirements are best achieved when gold electroplating coating range between 0.00005 and 0.0001 inch (50 and 100 micro inches) thickness.

Gold Plating and Gold Electroplating hardness grades:

1. 90 knoop, maximum
2. 91 – 129 knoop, inclusive
3. 130 – 200 knoop, inclusive
4. 201 knoop, minimum

Tuesday, October 22, 2013

Metal Electroplating

Metal electroplating have been applied over recent decades. Many application on using of electroplating process have been developed for many purposes like enhance the corrosion resistance, or for decorative purposes to make some metal have better appearance.

For other purposes the characteristic of electroplating often use because of electroplating is often also called as electro deposition. Electro deposition is the process of producing a coating, usually metallic, on a surface by the action of electric current. The deposition of a metallic coating onto an object is achieved by putting a negative charge into one electrode cell. The metal ion like salt carry a positive charge and are thus attracted to the object. This method often use on collecting metal from the solution that may be have high concentration. The result like to extract something from mixing solution then we can collect of just metal that dissolve in the solution.

Electroplating uses a form of electrolysis in which the electrodes play a bigger role than just conducting the current. Using electric current we can coat metal of one electrode with the metal of other. Jewelry and silverware can be silver, or gold plated, while zinc is often used to coat iron to protect against rust.

Friday, August 30, 2013

Sulfuration Treatment or Selective Metal Recovery on Electroplating Industry

As state on the journal of electroplating that is released in Global Nest written by some experts from Japan, said the difficulties of separate of metal content on electroplating sludge makes it difficult to recycle and reuse them. In the viewpoint of environmental protection as well as resource saving, the effective methods for recycling and reuse of sludge metal are required to be developed urgently.

Selective recovery method of metals from mixed metal waste water by sulfuration treatment is proposed. Sulfuration treatment is characterized by low solubility of metal sulfides; metal sulfides are, in general, lower in solubility than that of metal hydroxides. Separation of metal like copper, zinc and nickel which are commonly use from mixed solution in variouse pH ranges was conducted by employing three sulfurating agents; sodium sulfide (Na2S), sodium disulfide (Na2S2) and sodium tetrasulfide (Na2S4). Aqueous solution of CuSO4, ZnSO4 and NiSO4 and those of real plating wastewater, of which the initial concentrations were adjusted to 100-300 mg dm3 were employed.

By sulfuration treatment of the solution using sulfurating agent without adjusting pH, CuS was first precipitated, but ZnS and NiS were also precipitated at the same time. The result sawn from the formation behavior of metal prcipitates depended on pH value of the solution. For the sulfuration with three kinds of sulfurating agent, copper was first separated from the solution as CuS in pH = 1.4 – 1.5, then ZnS was separated in pH = 2.4 – 2.5, followed by the precipitation of nickel sulfide, NiS in the residual solution as pH = 5.5 – 6.0. The effective agent to make selective precipitation of sulfides use Na2S, Na2S2 and Na2S4. The selective of CuS in the filtrated cake obtained by the sulfuration treatment in pH = 1.4 – 1.5 was about 94%. The sequent selectivity of ZnS and NiS in the cake after the sulfuration treatment in pH = 2.4-2.5 were 75-77 % and about 20%, respectively. The selective of NiS and ZnS in the cake after sulfuration treatment in pH = 5.5 – 6.0 was 64% and 33 – 35 % respectively.

Wednesday, May 22, 2013

Bright Chrome Plating

Chrome substance is generally in commercially materials in bulk form. It is a chemical substance that is used as source as Chromium. Chrome is a metal, but it is not useful as a solid or pure substance. They are never in a solid chrome form. Even though many items are not polished or buffed prior to being chrome plated they still have a lustrous finish if desired.

Generally this plating use nickel plated base to commercial chrome plating. The lustrous finish is obtained with this layer of nickel. Bright chrome plating generally applies to industrial applications and can be achieved on many types of metals include of brass, steel, stainless steel, zinc die-cast and ABS plastics.

Chrome is applied after the base coat of nickel to prevent the nickel from tarnishing. It is sometimes described as having a more 'silver' look than nickel. The bright Chrome plating is more reflective, bluer, greyish and more specula. The reflection of bright chrome plating is deeper, less distorted, more like a mirror than other finishes.

Other application of chromium plating is hard chrome is metallic in appearance but is not particularly reflective or decorative. It is not really harder than other chrome plating, it is called hard chromium because it is thick enough that a hardness measurement can be performed on it if compare to decorative chrome plating that is only millionths of an inch thick.

Saturday, April 13, 2013

Chrome plating aluminum wheels

Chrome plating aluminum wheels will create a corrosion protected part, but not make the wheel stronger. It's depend on the raw material use for car wheel. Chromium plating aluminum wheel is involved in two kind electroplating method. The first should know the chromium process itself and the second one must understand how chrome electroplating can work on the aluminum surface.

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