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Information @ a Glance

General
  • Pure silver has a brilliant white metallic luster. It is a little bit harder than gold and is very ductile and malleable. Pure silver has the highest electrical and thermal conductivity of all metals, and possesses the lowest contact resistance. Silver is stable in pure air and water, but tarnishes when exposed to ozone, hydrogen sulfide, or air containing sulfur.
  • Typically a silver-plating specification will specify a matte, semi-bright, or bright finish with or without a chromate post treatment to improve tarnish resistance. Plating specifications also designate the base coating to be applied under the silver plate. The thickness of coatings can range from 1 micron for short-term shelf life and solderability, to 10 microns for thermo-compression bonding and die attachment, and up to 40 microns for severe wear resistance applications.

Process

  • Silver plating intended for engineering purposes is usually employed for solderable surfaces, electrical contact characteristics, high electrical and thermal conductivity, thermocompression bonding, wear resistance of load-bearing surfaces, and spectral reflectivity.
  • In order to locate the silver deposition on a selected area of the fabric, it is necessary to make the fabric surface act as a catalyst. The activation energy of the catalytic route is lower than the homogeneous reaction in solution. A smooth deposition is obtained if the metal deposited by autocatalysis acts as a catalyst. Based on the method of chemical silver-plating for a nonmetal substrate, three main steps, namely pre-treatment, the plating process and post-treatment were employed.

Applications

  • Advantages of Silver Electroplating: Superior Fatigue Resistance, Provides Dry Lubricity, Corrosion Resistance, Thermal Conductivity, Electro Magnetic Shielding, Offers Malleability, Reduces Friction, Facilitates Joining of Materials, High Tensile Strength, High Ductility, Algaecidal Bactericidal Antibacterial , Advantageous Alloying and, Wetting Properties, Efficient Catalyst , Resists Oxidation.

  • The plating thickness of some items, such as fuse caps, is less than one micron although the silver then tarnishes more easily. Coatings of two to seven microns are normal for heavy duty electrical equipment. Silver plating is used in a wide variety of applications from Christmas Tree ornaments to cutlery and hollowware.

  • The silver plated fabric has very effective shielding of electromagnetic radiations, also in the frequency range of mobile phones. The plated composite yarn after deknitting can be used as very flexible and expandable wire for special, low current applications. It also can be knit into any desired shape since the plated metal layers endure the deknitting and knitting process. By appropriate voltage supply a extremely flexible and accurately controllable heated fabric sheet, or any other shape device can be made by knitting weaving.

Market and Report

  • Today, apart from London, the largest supplier of silver to India is China. As the Indian market develops and a wider range of precious metal investment products becomes available, there will be increased trading opportunities within India and with the global market which will benefit from being backed by the quality assurance of the Good Delivery List. Approximately 4,000 tonnes of silver are consumed annually in India, the vast majority of which is used in the production of ornamental items jewellery, utensils and gift articles. Industrial uses play a smaller part, accounting for about 300 tonnes. 

  • Industrial uses account for about 300 tonnes of consumption a year. The biggest increase in industrial silver demand in India last year came from pharmaceutical and chemical usages, which rose over 60 %, with much of the growth due to silver nitrate production. In addition to its uses in photography and medicine, silver nitrate is used to make mirrors, indelible ink and silver plating. 

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