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Tarnish & Corrosion Prevention for Aluminium with Alkali Metal Silicate

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Tarnish & Oxidation Resistant Copper Foil

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Tarnish colours caused by welding & their corrosion effect on high alloyed chromium nickel steels

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Welding modifies the composition of the chromium-rich surface layer responsible for corrosion resistance of stainless steels, mainly at & around the weld seam. The effect is discussed, means for its mitigation set out.

Tarnish films on electrical contact materials

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Comments on so-called flowers of sulphur environment used in tarnish testing. Data on porous gold, silver (comparing flowers of sulphur with hydrogen sulphide), copper and nickel. Effects of lubricant (for ag). Effect of surface roughness on contact resistance after tarnishing. 9 refs

Tarnish Growth on Silver Film Conductors Related to Potential Resistor Failure in Telephone Offices

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Study of failure of thin film Ag resistors as Ag is converted to the sulphide in telephone exchanges. The effect was used (after calibration) to measure tarnish rate. Graph shows linear change in conductance over 50 hrs at 2.8 ppb sulphur at 25°C. Effects of various protective coatings is also shown. Effects with thick & thin Ag films, effect of S temperature & sulphur vapour conc'n (10E-2 to 10E+2 ppb) is plotted. Effects of air velocity are shown. 7 refs

Tarnish Inhibiting Composition and Article Containing it.

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An effective tarnish inhibiting ("Tl") polymer composition including a scavenger for hydrogen sulfide optionally in the presence of an acid gas such as sulfur dioxide, provides excellent protection against tarnishing of the lustrous surfaces of a silver object. When the composition is thermoformed into a box-like container or extruded as film which contains uniformly dispersed solid micron-sized particles of the scavenger chosen from zinc oxide and a silicate of an alkali metal in an amount no greater than 5% by weight of the polymer, it is transparent so that the condition of the stored silver may be assessed. A solid inert adjuvant may be added. All solid particles in the material have primary particle size smaller than 53µm which makes it possible to obtain the uniform dispersion. A silver object may be wrapped in the film, or stored in a sealed box so that the solid particles in the polymer are not coated on the surfaces of the silver object.

Tarnish inhibiting composition and article containing it.

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Tarnish inhiting composition consisting essentially of a substantially non-hydrolysable polymer having substantially homogeneously dispersed therein 0.01 to 5 wt. % of an essentially anhydrous scavenger including an alkali metal silicate and zinc oxide and optionally from 0.01 to 1 wt. % of an inert adjuvant, provided that the polymer has a water vapour transmission rate (WVTR) at least as high as that of low-density polyethylene. Protection in sealed containers of silver articles in atmospheres containing 1 ppb toi 10 ppm of hydrogen sulphide at a relative humity of 90% and 37.4 deg. C for at least one year is specifically claimed.

Tarnish Mechanism of Silver & Copper

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Note summarising results of chamber tests where sulphur dioxide, hydrogen sulphide or free sulphur (S8) were added contaminants. Tarnish kinetics (Ag sulphide film growth) are summarised &species on surfaces (oxides, sulphides, sulphates) are discussed in terms of conditions which favour each. Effects of contaminant concentration are also summarised.

Tarnish mechanism of silver plating and anti-tarnish process

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Performance of Ag (alloy) electrodeposits and corrosion resistance in moist heat, salt spray and atmos. environment containing hazardous industrial gases were studied. Various anti-tarnish processes were investigated and order of effectiveness was found to be approximately: organic coatings > palladium-nickel plating > inorganic coatings > electrocoatings > electrochemical passivated > chemical passivated. Lubricating protective agent is recommended for tribological applications.

Tarnish of Silver in Aqueous Solution & Properties of Tarnish Layer

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Electrochem. study shows polarisation plots, kinetics of tarnish (sulphide). Kinetics of bromide & iodide formation also shown. Specific electrical conductivities of these films are reported. Thermodynamics are given. 20 refs.

Tarnish prevention of brass etc by lacquering

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Case study where copper, nickel, chromium & brass are protected with environmentally-compliant lacquer. Rack plating with random loading is followed by lacquering which is HVLP hand sprayed or automatically sprayed. Details are given. see www.finish1.com

Tarnish Prevention of Copper Film by Vacuum Coating with Volatile Hydrocarbon Halide

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Tarnish Prevention of Silver

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Brief note mentions chromate coatings, transparent electrophoretic lacquers & electrodeposition of thin films of noble metal.

Tarnish prevention of silver contact surface

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Ag surface, esp. of electrical contact is protected against tarnishing and corrosion by applying 0.1 to 0.2µm thick tin film which oxidizes forming opt. protection, either by electrodeposition or immersion.

Tarnish prevention of silver watches

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Ag (alloy) or Ag plate, is coated with tarnish resistant film by cathodic treatment in soln. containing phosphate 75-85, chromate 15-25, surface active agent 0.1-1%.