Abstract:
A corrosion-protection composition that generally includes a water-soluble trivalent chromium salt and a water-soluble polymer is disclosed. The composition preferably is in the form of an aqueous solution (i.e., the composition additionally includes water as a solvent) that can be applied to an active-metal substrate to form a coated substrate and a corrosion-protection film upon drying. Additional ingredients in the corrosion-protection composition can include a second water-soluble salt (e.g., cobalt, manganese, nickel, and/or iron salts), a crosslinking agent, and/or a coloring agent. The corrosion-protection composition is substantially free of hexavalent chromium, capable of forming a film on an active-metal substrate, and is substantially non-reactive with the active-metal substrate. Once applied, the corrosion protection-film is resistant to moisture.
Abstract:
Die Erfindung betrifft ein Verfahren zur Beschichtung einer metallischen Ober-fläche mit einer wässerigen Zusammensetzung zur Vorbehandlung vor einer weiteren Beschichtung oder zur Behandlung, bei der die Zusammen-setzung neben Wasser a) mindestens ein hydrolisierbares oder zumindest teilweise hydrolysier- tes Silan, b) mindestens ein Metallchelat und ggf. auch c) mindestens einen organischen Filmbildner, d) mindestens einem langkettigen Alkohol als Filmbildungshilfsmittel oder/und e) mindestens eine anorganische Verbindung in Partikelform enthält, wobei die saubere, gebeizte, gereinigte oder/und vorbehandelte metallische Oberfläche mit der wässerigen Zusammensetzung in Kontakt gebracht und ein Film auf der metallischen Oberfläche ausgebildet wird, der anschließend getrocknet wird, teilweise oder gänzlich durch Verfilmen verdichtet wird, und ggf. zusätzlich ausgehärtet wird, wobei der getrocknete und ggf. auch aus-gehärtete Film eine Schichtdicke im Bereich von 0,01 bis 10 µm aufweist. Ferner betrifft die Erfindung entsprechende wässerige Zusammensetzungen.
Abstract:
Metallic fuel cell components that are at least partially coated with a coating comprising silane are provided. Methods of protecting a metallic fuel cell component from corrosion is provided, in which the methods comprise at least partially coating a fuel cell bipolar separator plate with a coating comprising a silane. Also included are fuel cells and fuel cell stacks comprising such metallic fuel cell components and methods for manufacturing such.
Abstract:
An aqueous agent for treating a substrate, characterized in that it comprises at least one chitosan component (A) selected form among chitosan and chitosan derivatives and a metal compound (B) containing at least one metal selected from among Ti, Zr, Hf, Mo, W, Se, Ce, Fe, Cu, Zn, V and trivalent Cr. The agent can be used for improving the adhesiveness between a metal material and a covering resin layer such as a film and a coating and also improving the resistance to corrosion and a solvent of a metal material or the like.
Abstract:
Compositions and processes are disclosed for producing improved electrical insulation, environmental protection, corrosion resistance and improved paint adhesion for metals; e.g., ferrous, aluminum, or magnesium alloys; as well as other substrates such as anodized metals, glasses, paints, plastics, semiconductors, microprocessors, ceramics, cements, silicon wafers, electronic components, skin, hair, and wood upon contact. The compositions and processes comprise use of one or more Group IV-A metals, such as zirconium, in combination with one or more non-fluoanions while fluorides are specifically excluded from the processes and compositions above certain levels. The processes can contain pretreatment stages that serve to activate a substrate surface and/or promote formation of metal- and mixed-metal oxide matrices through use of an oxygen donor. The compositions are at a pH below about 5.0 and are preferably in a range between about 1.0 and about 4.0. The coatings may contain additives such as surfactants, sequestering agents, or other organic additives for improved corrosion protection and paint adhesion. The substrate may be treated by immersion, spray, fogging or rollcoat and other common application techniques.
Abstract:
The invention relates to a method for treating metallic surfaces consisting of zinc, magnesium or aluminium or of the alloys of zinc, magnesium or aluminium, to which lacquer, coatings of plastic material, paint, sealants or adhesives are applied after treatment. The treatment of the metallic surfaces takes place at between 10 DEG C and 100 DEG C by immersion, spraying or rolling with an aqueous solution. The solution has a pH of between 2 and 13 and contains one or more compounds of the type XYZ at a concentration of between 10 and 1 mol/l. Y is an organic group containing between 2 and 50 C atoms and has a straight-chain structure. X is a COOH, HSO3, HSO4, (OH)2PO, (OH)2PO2, (OH) (OR') PO or (OH) (OR') PO2 group. Z is a OH, SH, NH2, NHR', CN, CH=CH2, OCN, epoxy, CH2=CR''-COO, acrylamide, COOH, (OH)2PO, (OH)2PO2, (OH) (OR') PO or (OH) (OR') PO2 group. R' is an alkyl group with between 1 and 4 C atoms. R'' is an H atom or an alkyl group with between 1 and 4 C atoms. Groups X and Z are each bonded to group Y in their final positions.
Abstract:
A highly corrosion-resistant, paint-adherent, and lubricating polymer-containing coating on a metal surface can be formed by contact with an aqueous solution (pH = 2.0 to 6.5) that contains an acidic compound and polymer with formula (I) in which the X bonded to the phenyl ring in formula (I) represents a hydrogen atom, a hydroxyl group, a C1 to C5 alkyl group, a C1 to C5 hydroxyalkyl group, a C6 to C12 aryl group, a benzil group, a benzal group, an unsaturated hydrocarbon moiety condensed to the phenyl ring so as to form a naphthalene ring, or a group corresponding to formula (II) in which R and R in formula (II) each independently represents a hydrogen atom, a hydroxyl group, a C1 to C10 alkyl group, or a C1 to C10 hydroxyalkyl group; the Y and Y bonded to the phenyl ring in formulas (I) and (II) each independently represents a hydrogen atom or a group Z according to one of formulas (III) and (IV) in which each of R , R , R , R , and R in formulas (III) and (IV) independently represents a C1 to C10 alkyl group or a C1 to C10 hydroxyalkyl group; the X's bonded to the phenyl rings in the polymer molecule may all be identical or may differ from one another; each of the Y 's and Y 's bonded to the phenyl rings in the polymer molecule may all be identical or may differ from one another; the average value for the number of Z groups substituted on each phenyl ring in said polymer molecule is 0.2 to 1.0; and n has a value of 2 to 50.
Abstract:
Des revetements de conversion du type a oxyde metallique hydrate sont deposes sur un substrat de Al, Mg, Sn ou Zn ou d'un alliage de ces metaux, a partir d'une solution aqueuse de AlIII possedant un pH de 1,5 a 5,5 et contenant du NO3-. Le revetement produit est un oxyde d'aluminium hydrate. Des revetements de conversion possedant une resistance a la corrosion encore amelioree sont produits a partir de solutions comprenant du borate et possedant des pH allant de 4 a 5,5.