Abstract:
A corrosion protection material and method for non-metal alloys, particularly light aluminium alloys. The method comprises the steps of coating a material to be protected with a layer containing a chromium-free inhibitor, consisting of at least one dihydroxyazoic salt having structural unit (a), wherein Y is a salt producing anion and M is a metal. For the same number of moles, protection with an effectiveness comparable to that of chromate inhibitors may thus be achieved.
Abstract:
Anti-corrosive protective compositions for metal, which composition contains a curable binder with after curing low water and oxygen permeability and at least one filler composed of solid parts, characterised in that the filler contains expanded polymer parts with a size of 1 to 100 micrometers.
Abstract:
An anticorrosive, pigmentary coating composition characterized in that it contains hydroxy-8-quinoleate of zinc. In a preferred embodiment, the composition comprises a powdered mixture of pigments including a combination of a) 0.5-99.5% weight of hydroxy-8-quinoleate of zinc, and b) 0.5-99.5% weight of at least one of the following compounds: zinc phosphate, iron phosphate, chromium phosphate, manganese phosphate, aluminium phosphate, aluminium oxide, calcium ferrite, zinc ferrite, magnesium ferrite, barium ferrite, iron ferrite, calcium borosilicate, barium borosilicate, calcium phosphosilicate, barium phosphosilicate, with the remainder consisting of pigments which are known in this field. The composition is useful as an anticorrosive coating, in particular for shipbuilding and protecting industrial metal structures.
Abstract:
An emulsion of an amine neutralized hydrocarbon oxidate composition including alkali metal e.g. sodium petroleum sulfonates is applied to metallurgically prepared roughened surfaces, e.g. carbonitrided steel, to form corrosion preventive films.
Abstract:
A composition suitable for coating metal objects to protect them from corrosion. The composition comprises: (A) an elastomer; and (B) at least one non-carbonated hydrated metal-containing complex of: (B-1) at least one metal-containing reagent; and (B-2) at least one acidic organic reagent or an ester or an alkali metal or alkaline earth metal salt thereof, wherein (B-1) is in stoichiometric excess to the acidic organic reagent or ester or alkali metal or alkaline earth metal salt thereof, and may also contain other components such as waxes, antioxidants, auxiliary corrosion preventives, etc. The compositions, when applied to a metal object are not readily removed or damaged when the coated objects are handled, and resist damage from impact and/or abrasion.
Abstract:
A composition for rust treatment comprises an aqueous film-forming emulsion and an effective amount of pyrogallol as a chelating agent for iron oxides.
Abstract:
A metal article is protected from corrosion under prolonged exposure to normal ambient atmospheric conditions which cause such corrosion by coating the metal article with an adherent organic coating which does not exude corrosive acid, which comprises an effective amount of an aromatic amine compound containing a p-phenylenediamine moiety which is not an epoxy cross-linking agent but which is capable of being oxidized in air, an air oxidation product thereof, or a mixture of the amine and air oxidation product for corrosion protection of the metal article, before the coated metal article is placed in contact with such atmospheric conditions which cause such corrosion.
Abstract:
The invention concerns the use of aqueous polymer dispersions for protecting metallic surfaces against corrosion. The aqueous polymer dispersions are based on copolymers of C2-C14 olefins and monomers which contain or can form by hydrolysis acid functional groups and which in addition also contain dyes and/or corrosion inhibitors dissolved or dispersed in the polymer phase.
Abstract:
A corrosion preventing factory or field applied coating has at least two discrete organic polymeric layers directly or indirectly united together. A first of said layers has a water vapour permeability of 0.005 to 10 g.mm/m /24h at 23 DEG C, 100 % RH. A second of said layers has an oxygen permeability of 0.01 to 10 cm .mm/m /24h.atm at 23 DEG C, 50 % RH, and/or a carbon dioxide permeability of 0.01 to 30 cm .mm/m /24h.atm at 23 DEG C, 50 % RH. In aggregate the coating has a water vapour transmission rate of 0.05 to 0.6g/m /24h at 23 DEG C, an oxygen transmission rate of 0.01 to 10 cm /m /24h.atm at 23 DEG C and/or a carbon dioxide transmission rate of 0.01 to 20 cm /m /24h.atm at 23 DEG C. These coatings can serve to greatly retard corrosion and in the case of the carbon dioxide barrier material greatly reduces stress corrosion cracking.
Abstract translation:防腐蚀工厂或现场涂覆涂层至少有两个离散的有机聚合物层直接或间接地结合在一起。 所述层中的第一层在23℃,100%RH下具有0.005-10g / mm 2 / 24h的水蒸汽渗透性。 所述层中的第二层在23℃,50%RH和/或二氧化碳渗透率为0.01至30cm 3时具有0.01至10cm 3 / mm 2 / 24h.atm的透氧度, 3℃/ m 2 / 24h.atm,23℃,50%RH。 总体而言,涂层在23℃下的水蒸气透过率为0.05〜0.6g / m 2 / 24h,23℃时的透氧率为0.01〜10cm 3 / m 2 / 24h。 ℃和/或二氧化碳透过率在23℃时为0.01至20cm 3 / m 2 / 24h.atm。这些涂层可用于大大延缓腐蚀,在二氧化碳屏障材料的情况下 大大减轻了应力腐蚀开裂。
Abstract:
A system is disclosed for inhibiting the corrosion of ferrous and other metals by passivating the metals. The system includes novel buffered compositions which may be applied to metal products for preventing or retarding corrosion and methods for applying the buffered compositions to metal products such that corrosion protection of the products is achieved through passivation. The methods include an in-situ application to existing structures with metal reinforcement as well as applications to metal products during manufacture. Generally, the compositions may be in various forms and comprise a carrier component and one or more pH buffer components. The buffer is selected to retain the proximity of the metal at a pH at which the metal is passive to corrosion. The compositions are environmentally friendly and are capable of replacing chromates which have been traditionally used with zinc and zinc alloys to inhibit corrosion of metals but which are potentially harmful to the environment.