摘要:
The invention concerns in a first aspect a method of anodizing an article of aluminium or aluminium alloy for forming a porous anodic oxide coating, comprising the steps of -an immersion step of immersing the article to be anodized in an electrolyte in a tank, wherein the electrolyte comprises an aqueous solution of 5-50 g/l sulphuric acid and 2-50 g/l phosphoric acid, and arranging the article as an anode with respect to one or more counter electrodes as arranged cathodes in the electrolyte -an anodizing step of applying a positive anode voltage Va to the article, while the temperature of the electrolyte is in the range of 33-60 °C.
摘要:
Un método de coloración estructural para colorear un sustrato de aluminio que comprende la formación de una nanoestructura de cristales fotónicos unidimensionales mediante un proceso de anodización con corriente por pulsos periódicos, en donde el color obtenido depende del tiempo de aplicación de la densidad de corriente máxima y/o mínima del pulso y en donde dicho color varía con el ángulo de observación.
摘要:
Development of an alternative process to conventional toxic chromic acid anodization (CAA) with equivalent corrosion resistance is a challenging task. The present invention provides a chromate free process for the manufacture of corrosion resistant sealed anodized coating for long term corrosion resistance of aerospace grade aluminum alloy. This method includes the steps of cleaning, chemical etching, anodizing in Tartaric–Sulphuric acid electrolyte followed by dipping the specimen in the sealing bath containing at least two water soluble either Mn and Mo or Mn and V oxyanions as corrosion inhibitors and a sufficient amount of alkali metal ion based nitrates at a temperature range between 60 and 800C for about 20 to 40 minutes at a pH range of 7 to 9. The sealed anodic coatings developed from this invention showed improved corrosion resistance in neutral 5% NaCl fog environment for greater than 2000 h of exposure. The sealed anodic coatings developed by this invention also showed self-healing protection in NaCl environment.
摘要:
The invention is related to chemical treatment applied to products made of aluminum or aluminum alloys, that have been first submitted to anodic oxidation and pore sealing according to known prior technics, the invention comprising two additional steps: - a treatment with an alkali-silicate solution; - a treatment with silanes solutions. The products according to the invention are showing improved resistance to corrosion tests to acid and alkalis.
摘要:
A plant and a process are disclosed for the continuous anodizing treatment of products made of aluminium or alloys thereof. The plant comprises means for feeding the products along a treatment path, at least one tank for collecting and/or storing a liquid electrolyte solution and a plurality of pipes made of an electrically insulating material and adapted for supplying jets of the liquid electrolyte solution towards the products along the treatment path, the solution being pressurized by a pump. Cathode electrodes are arranged in electric contact with the liquid electrolyte solution, and anode electrodes are arranged in electric contact with the products.
摘要:
Die vorliegende Erfindung betrifft ein Verfahren zum Herstellen einer wasser- und eisabweisenden Oberfläche auf einem metallischen Substrat, aufweisend die Schritte des a) Bereitstellens eines metallischen Substrats, des b) Polierens des metallischen Substrats, des c) Inkontaktbringen mindestens eines Teils der metallischen Substratoberfläche mit einer Elektrolytlösung, des d) Anodisierens des metallischen Substrats aus Schritt c) zur Herstellung einer nanoporösen Schicht auf der Substratoberfläche, und des e) Aufbringens einer hydrophobierenden Beschichtung auf der nanoporösen Schicht. Damit kann die Ansammlung von Eis insbesondere auf angeströmten Flächen von Fluggeräten gegenüber dem Stand der Technik reduziert werden.
摘要:
Provided is a process for the electrochemical formation of a metal oxide film on a surface of a metal substrate comprising a valve metal, said process comprising the step of anodizing the metal substrate In an electrolyte, characterized in that the electrolyte comprises at least 85% by weight of an oxoacid of phosphorus, based on the total weight of the electrolyte. Moreover, the invention provides metal oxide films with a characteristic structure including channels in a metal oxide matrix that can be prepared by the process.