Gold bronze

Goldbeater Gold-beryUium Gold bronzes Gold-cadmium alloys Gold-calcium alloy... 

Definition. Metal effect pigments consist of flakes or lamellae of aluminum (aluminum bronzes), copper and copper-zinc alloys ( gold bronzes ), zinc, and other metals (DIN 55943, 55944 FSO 4618-1). 

Copper and Gold Bronze Pigments. Copper and gold bronze pigments (powdered copper-zinc alloys) are usually produced by dry milling. Depending on the alloy composition, the following natural shades are produced ... 

Copper and gold bronze pigments are not as colorfast as aluminum pigments because they decompose to produce colored oxides and corrosion products. However, stabilized pigments (e.g., with a silica coating) are also available for critical applications in binders with high acid values or that react with copper or zinc. 

When using gold bronze pigments the trimmed material should not be reprocessed because their increased exposure to heat oxidizes the pigment and will... 

Metal effect pigments are flake-shaped metallic particles supplied in the form of powders, pastes, pellets, suspensions or color concentrates [5.166-5.168]. Typical metal effect pigments include aluminum ( silver bronze ) and copper- and copper/zinc-alloys ( gold bronze ). 

Additionally there are oxidized gold bronze pigments available, which obtain deeper color shades by a controlled oxidizing process during manufacturing. 

The dry milling process is still the most commonly used method for making gold bronze, whereas the wet milling process is the state-of-the-art technology for manufacturing aluminum pigments. 

The metal pigments, gold bronze as well as aluminum, are supplied in the form of powders, pastes (including solvents), granules (including resins), suspensions (VMPs), color concentrates or even press-ready printing inks. 

Preferred supplied forms are powders (gold bronze), pastes (aluminum) in plasticizers (like white oil, DINP etc.) and pellets in polyethylene. Due to the chemical nature of gold bronze, there are special coated pigments for use in high temperature processes (tarnish- or heat-resistant gold bronze). Also for use in PVC, special chemically resistant aluminum and gold bronze pigments are available. 

AIRBORNE COPPER SLAG-iMILLED P 1721 GOLD GOLD BRONZE KAFAR COPPER Ml (COPPER) M2 (COPPER) OFHC Cu RANEY COPPER... 

Similar to (SN), in their one-dimen.sional conductivity properties are the stacked columnar complexes typified by [Pt(CN)4] . These. square planar ions adopt a closely spaced parallel arrangement, allowing for considerable interaction among the d.2 orbitaLs of the platinum atoms. These orbitals are normally filled with electrons,. so in order to get a conduction band some oxidation (removal of electrons) must take place. This may be readily accomplished by adding a little elemental chlorine or bromine to the pure tetracyanoplatinate salt to get stoichiometries such as K2[Pt(CN)4]Br in which the platinum has an average oxidation state of +2.3. The oxidation may al.so be accomplished electrolytically. as in the preparation of Rb2[Pt(CN)4](FHF)o4 (Fig. 16.8), which has a short Pt—Pt separation. The Pt—Pt distance is only 280 pm. almost as short as that found in platinum metal itself (277 pm) and in oxidized platinum pop complexes (270 to 278 pm see Chapter l5).- 2 Gold-bronze materials of this type were discovered as early as 1842, though they have been little understood until recent times. The complexes behave not only as one-dimensional conductors, but... 

Grade Powder that is also called gold bronze powder. An alloy of 90% copper and 10% aluminum reduced from leaf form to powder, polished mechanically, and coated with stearic acid. Available in... 

Liquid solutions salt water, iced tea, club soda Solid solutions brass, 14 K gold, bronze, stainless steel... 

Smokeless fuel was expected to become again a consumer product with all its new requirements, especially excellent physical quality and pleasing appearance. The latter motivated one producer in the UK to dip the briquettes into a special gold bronze die during curing to eliminate the dirty black coal look . 

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