摘要:
A composition and method for providing a blank chromate conversion coating is provided. The composition is substantially free of hexavolent chromium and provides a black finish, on zinc or zinc alloy coatings. The composition includes trivalent chromium ions, phosphorous anions, anions selected from the group consisting of sulfate ions, nitrate ions and combinations thereof, at least one of a transition metal or metalloid from Groups III, IVa, Va or VIII, and an organic chelate selected from the group consisting of carboxylic acids, polycarboxylic acids and combinations thereof.
摘要:
An aqueous acidic plating bath for the electrodeposition of a nickel or nickel alloy deposit. The bath includes nickel ions and an additive having the general formula: H2CnullCHCH2NR1R2 ornullH2CnullCHCH2NnullR1R2R3nullnXnnullwherein R1, R2 and R3 are selected from the functional groups consisting or hydrogen, methyl, ethyl, propyl, allyl, propyn, propanediol and combinations thereof; and Xnnull is an n-valent inorganic or organic anion.
摘要翻译:用于电沉积镍或镍合金沉积物的酸性电镀液。 该浴包括镍离子和具有以下通式的添加剂:H 2 C = CHCH 2 NR 1 R 2或[H 2 C = CHCH 2 N + R 1 R 2 R 3] n X 其中R 1,R 2和R 3选自由氢或甲基, 丙基,烯丙基,丙炔,丙二醇及其组合; X 为n价无机或有机阴离子。
摘要:
In a preferred embodiment of the present invention, a conversion coating composition comprising chromium (III) ions, cobalt (II) ions, and nitric acid is provided. The coating composition is substantially free of chromium (VI) ions and substantially free of an oxidizing agent. The present trivalent chromium based conversion coating provides corrosion protection equal to or greater than most hexavalent chromium conversion coatings.