Abstract:
The corrosion resistance of a metal substrate surface treated with an acidic aqueous composition to form a conversion coating is improved by first contacting the surface with an oxidizing acidic pre-rinse, such as an aqueous solution of nitric acid and hydrogen peroxide, or nitric acid and hydrofluoric acid, or Fe +3 cations and hydrofluoric acid.
Abstract:
A coating raw material is applied on the surface of a workpiece. The workpiece is heated, converting the coating raw material into a hard surface layer. The workpiece is then cooled. Independent claims are also included for the following: (A) a workpiece manufactured using the coating method; and (B) a coating device.
Abstract:
A process for producing a repair coating on at least one metallic surface that is coated with at least one corrosion protection coating A applied with at least one composition selected from the group of pretreatment compositions, of organic compositions and of silicon compound(s) containing compositions, whereby the at least one corrosion protection coating A has been at least partially removed in the area Z, whereby a thin corrosion protection coating B containing at least one silicon compound is applied with a solution or dispersion containing at least one silane, at least one silanol, at least one siloxane, at least one polysiloxane or any mixture of these (="siloxane composition") on at least a part of the area Z. Optionally, a further corrosion protection coating C may be applied on the thin corrosion protection coating B generated with the siloxane composition whereby the at least one further corrosion protection coating C is generated with at least one organic composition like a primer, a wet-primer, an e-coat, a powder coat, a base-coat or a clear-coat or with at least one composition which is the same or another siloxane composition as for the thin film B.
Abstract:
Die Erfindung betrifft ein Verfahren zur Beschichtung von metallischen Oberflächen mit einer Silan/Silanol/Siloxan/Polysiloxan enthaltenden Zusammensetzung, wobei die Zusammensetzung im wesentlichen besteht aus: a) mindestens einer Verbindung ausgewählt aus Silanen, Silanolen, Siloxanen und Polysiloxanen und b) mindestens zwei Verbindungen ausgewählt aus Titan-, Hafnium-, Zirkonium-, Aluminium- oder/und Bor-haltigen Verbindungen sowie gegebenenfalls c) aus mindestens einer Art Kationen ausgewählt aus Kationen von Metallen der 1. bis 3. und 5. bis 8. Nebengruppe einschließlich Lanthaniden sowie der 2. Hauptgruppe des Periodensystems der Elemente oder/und aus mindestens einer entsprechenden Verbindung, d) aus mindestens einer organischen Verbindung ausgewählt aus Monomeren, Oligomeren, Polymeren, Copolymeren und Blockcopolymeren oder/und e) aus mindestens einer den pH-Wert beeinflussenden Substanz sowie außerdem aus f) Wasser und g) gegebenenfalls aus mindestens einem organischen Lösemittel. Die Erfindung betrifft außerdem auch entsprechende wässerige Zusammensetzungen.
Abstract:
A coating composition comprising an aqueous mixture contain acid-stable particles and one or more fluoroacids. The amount of the acid-stable particles in the coating composition is from 0.005 % to 8 % by weight on a dry weight basis. The acid-stable particles can be selected from aluminum-modified silica particles, nonaluminum-modified silica particles, and organic particles selected from anionically stabilized polymer dispersion particles. The invention is also directed to a coating on a metal substrate. The coating contains acid-stable particles attached to the metal substrate through a metal-oxide matrix. The metal-oxide matrix comprises a metal selected from titanium, zirconium, silicon, hafnium, boron, aluminum, germanium, or tin. Fig 1 shows how the composition of a dried coating on a CRS panel prepared from the coating composition of Example 1 can change with spray time.
Abstract:
Aqueous compositions for post treating metal coated substrates such as cadmium-plated steel, and zinc-nickel coated substrates and the process for using said compositions to provide a color recognizable coating and, to improve the corrosion-resistance, abrasion, electrical, and adhesion properties of the coating. The post-treatment composition comprises an acidic aqueous solution having a pH ranging from about 2.5 to 5.5 and contains effective amounts of trivalent chromium compounds, alkali metal hexafluorozirconates, at least one divalent zinc compound, alkali metal fluoro-compounds, and effective amounts of water soluble thickepers, wetting agents or surfactants.
Abstract:
In at least one aspect, the invention relates to an entirely or substantially chromium-free conversion coating composition and process for conversion coating metal surfaces that provides corrosion resistance. In at least another aspect, the present invention relates to an article having a metal surface that is at least partially coated with an entirely or substantially chromium-free conversion coating that provides corrosion resistance. In certain embodiments, the conversion coating composition comprises water and (A) dissolved fluorometallate anions selected from the group consisting of TiF 6 -2 , ZrF 6 -2 , HfF 6 -2 , SiF 6 -2 , A1F 6 -3 , GeF 6 -2 , SnF 6 -2 , BF 4 - , and mixtures thereof and (B) a water-soluble polymer which is a Mannich adduct of poly(4-vinyl phenol) and N-methyl ethanolamine. In other embodiments, the composition also comprises (C) a water-soluble polymer which is a Mannich adduct of poly(4-vinyl phenol) and N-methyl glucamine.