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The gold is typically applied by quick immersion in a solution containing gold salts. Some of the nickel is oxidized to Ni 2+ while the gold is reduced to metallic state. A variant of this process adds a thin layer of electroless palladium over the nickel, a process known by the acronym ENEPIG. [1]
Electrochemical coloring of metals is a process in which the surface color of metal is changed by electrochemical techniques, i.e. cathodic or anodic polarization. The first method of electrochemical coloring of metals are certainly Nobili's colored rings, discovered by Leopoldo Nobili , an Italian physicist in 1826.
The 4-pin mini-DIN that is most common in consumer products today debuted in JVC's 1987 S-VHS. The 7-pin mini-DIN is commonly used on laptops. Used with PAL, NTSC or SECAM color. Where two connectors are used, they are labeled Chroma and Luma. MDA: 1981: DE-9: Digital: 720 × 350 @ 50, Text only: IBM PC, PC/XT, PC/AT and compatibles: RGBI : 640 ...
Some connector styles may combine pin and socket connection types in a single unit, referred to as a hermaphroditic connector. [6]: 56 These connectors includes mating with both male and female aspects, involving complementary paired identical parts each containing both protrusions and indentations. These mating surfaces are mounted into ...
Electroless nickel-boron plating developed as a variant of the similar nickel-phosphorus process, discovered accidentally by Charles Adolphe Wurtz in 1844. [2]In 1969, Harold Edward Bellis from DuPont filed a patent for a general class of electroless plating processes using sodium borohydride, dimethylamine borane, or sodium hypophosphite, in the presence of thallium salts, thus producing a ...
Add gold to your investment portfolio today. In a recession. In a rough economy, gold often takes the lead — living up to its reputation as a safe haven. Ebkarian cites the 2008 financial crisis ...
Chemical coloring of metals is the process of changing the color of metal surfaces with different chemical solutions. The chemical coloring of metals can be split into three types: electroplating – coating the metal surface with another metal using electrolysis. patination – chemically reacting the metal surface to form a colored oxide or ...