<form id="vrefx"></form>

    <nobr id="vrefx"></nobr>

    <nav id="vrefx"><listing id="vrefx"></listing></nav>

    • 18764172899

    • [field:companyname]
    當前位置:首頁 - 新聞資訊 > 公司動態 >


    來源:http://www.thinkgreeninitiative.com/ 發布時間:2021-12-27
    1、 Galvanic corrosion
    When aluminum comes into contact with other metals, aluminum is always at the anode to accelerate its corrosion. Galvanic corrosion is also called bimetallic corrosion. The severity of corrosion is determined by the relative position of two metal potential sequences. The greater the potential difference between aluminum profiles, the more serious the galvanic corrosion is. Almost all aluminum alloys can not avoid galvanic corrosion.
    2、 Pitting corrosion
    Pitting corrosion, also known as pitting corrosion, is an extremely local corrosion form of needle tip, dot and hole on metal. Aluminum will have point corrosion in the atmosphere, fresh water and neutral aqueous solution, and can also lead to perforation in serious cases, but the corrosion amount remains at a limit value.
    3、 Intergranular corrosion
    The cause of intergranular corrosion is related to improper heat treatment. Alloying elements or intermetallic compounds precipitate along the grain boundary. Compared with the grain, the anode forms a corrosion battery, causing the acceleration of intergranular corrosion.
    4、 Filiform corrosion
    Filiform corrosion is a kind of under film corrosion. This film can make the paint film or other layers, which generally does not occur under the anodic oxide film. Aluminum profile will be pretreated before coating, which is related to environmental factors, such as humidity, temperature, chloride, etc.
    5、 Crevice corrosion
    There is a gap between the aluminum profile itself and the surface of other materials. Due to the action of differential inflatable battery, the corrosion in the gap is accelerated, but there is no effect outside the gap. Crevice corrosion has little to do with the type of alloy. Even very corrosion-resistant alloys will produce crevice corrosion.
    The above is the main content shared by the door and window processing equipment. Please continue to pay attention to us for more wonderful contents: http://www.thinkgreeninitiative.com