Abstract:
Die Erfindung betrifft ein alkalisches Galvanisierungsbad sowie ein Verfahren zur kathodischen Abscheidung von Zink-Nickel-Legierungsüberzügen, wobei das Bad ein oder mehrere Polyethylenamine als Komplexbildner enthält. Durch Zugabe eines Arylsulfonats wie etwa Cumolsulfonat oder Xylensulfonat wird die Löslichkeit des Komplexbildners erhöht, bzw. seine lokale Abscheidung an der Kathode vermindert. Hierdurch wird eine Erhöhung der anwendbaren Stromdichte und der Stromausbeute unter Abscheidung homogener Galvanisierungsschichten ermöglicht und die benötigte Arbeitsdauer verkürzt.
Abstract:
Bain constitué d'une solution aqueuse acide, exempte d'ion ammonium, d'ions fluoroborate et d'ion citrate et comprenant par litre: de 10 à 60 g d'ions Zn 2+ ; de 20 à 100 g d'ions Mn 2+ ; caractérisé en ce qu'il comprend un agent tampon maintenant le pH à une valeur comprise entre 3,0 et 7 et, de préférence, entre 4,5 et 6 et mieux encore entre 4,8 et 5,5 et un autre agent, distinct de l'agent tampon, permettant de rapprocher les potentiels de déposition du couple Zn/Zn 2+ et du couple Mn/Mn 2+ . Ce bain est utile pour déposer un alliage de Zn et de Mn par électrolyse.
Abstract:
The invention relates to a method for electrolytically coating metalswith zinc or a zinc alloy. Matt surfaces are obtained by depositing zinc from an electrolyte solution containing a zinc salt selected from zinc sulphate or an alkane sulphate of zinc or mixtures thereof and optionally other metal salts, an acid selected from sulphuric acid or an alkane sulphonic acid or a mixture of both acids and at least one additive for improving surface roughness and for avoiding dendritic edge growth, selected from surface active compounds containing nitrogen which can be ionic or non-ionic, anionic surface active compounds containing nitrogen, and surface active compounds derived from multi-fuctional alcohols with at least three hydroxy groups. The invention also relates to an electrolytic composition for an electrolytically coating of metals with zinc or zinc alloys, in addition to the use of the above-mentioned additives for improving surface roughness and avoiding dentritic edge growth when metals are electrolytically coated with zinc or a zinc alloy in an electrolyte containing alkane sulphonic acid.
Abstract:
The invention relates to ternary tin zinc alloy coatings 30 - 65 wt. % tin, 30 - 65 wt. % zinc and 0.1 - 15 wt . % metal from the following group as a third alloy component; iron, cobalt, nickel. Correspondingly, alloy coatings can be produced by means of electrolytic deposition from aqueous galvanic electroplating solutions which contain the components of the alloy in a dissolved form. The alloy coatings are characterised in that they have a particularly high resistance to corrosion and are particularly suitable as anti-corrosion protective coatings on iron-based materials.
Abstract:
The invention relates to a method for electrolytically coating metalswith zinc or a zinc alloy. Matt surfaces are obtained by depositing zinc from an electrolyte solution containing a zinc salt selected from zinc sulphate or an alkane sulphate of zinc or mixtures thereof and optionally other metal salts, an acid selected from sulphuric acid or an alkane sulphonic acid or a mixture of both acids and at least one additive for improving surface roughness and for avoiding dendritic edge growth, selected from surface active compounds containing nitrogen which can be ionic or non-ionic, anionic surface active compounds containing nitrogen, and surface active compounds derived from multi-fuctional alcohols with at least three hydroxy groups. The invention also relates to an electrolytic composition for an electrolytically coating of metals with zinc or zinc alloys, in addition to the use of the above-mentioned additives for improving surface roughness and avoiding dentritic edge growth when metals are electrolytically coated with zinc or a zinc alloy in an electrolyte containing alkane sulphonic acid.
Abstract:
There is disclosed an electroplating bath for depositing zinc/manganese alloys on a substrate characterized in that it comprises an aqueous bath free or substantially free of ammonium halide and of fluoroborate which is made up from 10-150 g/l, alkali metal salt, 30-90 g/l boric acid, 10-200 g/l water soluble zinc salt, 10-50 g/l water soluble manganese salt, 60-140 g/l alkali metal gluconate or tartrate and a base e.g. an alkali metal hydroxide to bring the pH to the range 6.1-7.1. Passivates are also disclosed.
Abstract:
A polymer additive for alkaline zinc and zinc alloy electrodepositing media and processes comprises the reaction product of one or both of (i) a first di-tertiary amine of formula (1) where R' represents (a) or (b), and q is 2 to 6, R represents CH3 or C2H5 and each R may be the same or different and m is 2 to 4, and a second di-tertiary amine of formula (2) where B is CgH2g+1 and g = 0 or an integer, the respective B groups being the same or different, and f = 0 or an integer, and R'' represents CH3 or C2H5 and each R'' may be the same or different, with (ii) a di-halo alkane of the formula (4): A - (CH2)n - A, where A represents a halogen atom and n is at least 2. The resulting polymer preferably has general structure (I) where 0
Abstract:
The invention relates to a coating for components made of hardened steel or cast iron, which comprises two layers. The inner layer consists of either a zinc-cobalt alloy preferably containing between 0.1 and 6 % by weight Co or a zinc-nickel alloy preferably containing between 0.5 and 15 % by weight Ni. The outer layer is a zinc-nickel alloy preferably containing between 6 and 18 % by weight Ni. The present invention further relates to a method for producing said coating, according to which the inner layer is electrodeposited from an acid bath and the outer layer is electrodeposited from an alkaline bath.
Abstract:
Object: to develop a material which can be improved in the resistance to corrosion caused by alcoholic fuels after working without detriment to the weldability and without any substantial cost increase. Constitution: a chromate coating is formed on Zn-X-alloy electroplated steel sheets (wherein X is at least one element selected among 3-18 wt.% Ni, 0.02-3 wt.% Co, 25-45 wt.% Mn, and 8-20 wt.% Cr). The crack density of the Zn-X-alloy coating present under the chromate coating is 1,000-150,000/mm in terms of the spot surrounded by the cracks, among which cracks having the maximum width of 0.5 mu m or less account for at least 90 % and cracks whose depths are at least 80 % of the coating thickness account for at least 80 %.
Abstract translation:目的:开发可以改善在工作后由酒精燃料引起的耐腐蚀性的材料,而不损害可焊性并且没有任何显着的成本增加。 结构:在Zn-X合金电镀钢板上形成铬酸盐涂层(其中X是选自3-18重量%的Ni,0.02-3重量%的Co,25-45重量%的Mn中的至少一种元素, 和8-20重量%的Cr)。 存在于铬酸盐涂层下的Zn-X合金涂层的裂纹密度在由裂纹包围的点上为1,000-150,000 / mm 2,其中最大宽度为0.5μm或更小的裂纹占 至少90%,并且其深度至少为涂层厚度的80%的裂纹至少为80%。
Abstract:
An improved treatment for copper foil that is to be used for lamination to a board comprises electrodepositing a dendritic layer of copper on the side of the foil that is to be laminated to the board. The dendritic layer is secured by electrodepositing a gilding layer of copper over it. A barrier layer is next electrodeposited over the gilding layer. The barrier layer is formed by means such as electrodeposition from a solution containing ions of zinc, nickel and antimony. This in turn is covered with an anticorrosion layer that is formed of chromates or phosphates, disposed over the barrier layer.