The trouble began regulation of hexavalent chromium, ever it is the industry such as an automobile,which has been using the hexavalent chromium to"chromate treatment".
Taking advantage of the feature of this rust resistant, chromium had been used to as a"Chromium plating",or a post-processing of zinc-plated"Chromate treatment".
リン酸クロメート処理やジルコニウム処理品の場合、カットすることも多い。
Products that are processed using phosphoric acid chromate or zirconium are often cut.
Since galvanized surface is relatively more susceptible to discoloration andcorrosion than other plating types without any additional processes, chromate treatment is executed as postprocessing.
Please note, recently chromate treatment using trivalent chromium is becoming more popular as an alternative option to hexavalent chromium, and this trivalent chromium does not contain hexavalent chromium on treated surfaces.
ディッピング式前処理設備クロメート、ノンクロメート対応非鉄用。
Dipping type pre-treatment booth For chromate, non-chromate, non-ferrous.
価クロメート薄黄色最も一般的に処理されており、耐食性も良好である。
Trivalent chromate Pale yellow Most popularly used, and has good corrosion resistance.
耐食型3価クロメート黒色耐食性が良好で装飾部品にも処理されている。
Corrosion-resistant trivalent chromate Black Delivers good corrosion resistance and also used for decorative parts.
So far, black plating types such as black chromate and black chromium used or contained hexavalent chromium, and an alternative surface treatment to these had been demanded.
Because the chromate film as post processing prevents white rusting of zinc for a long time, its synergistic effect with 1 to 3 makes its rust prevention effect far superior to other rust prevention treatments.
(chromate containing trivalent chromium as an alternative to hexavalent chromium chromate) Bluish silver-white Used for parts for which corrosion resistance is not considered important, as it gives beautiful appearance. 24h or longer until white rust generation.
Chemical oxidation of aluminum products is weak alkaline or weak acid solution, part of the base metal reacts to the surface of the natural oxide film thickening process or produce some other passivation film,commonly used chemical oxide film has a chromate film and phosphoric acid membrane, which is thin and good adsorption, can be colored and sealing treatment, table-3 describes the chemical oxidation process aluminum products.
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