亚洲级αv无码毛片久久精品,国产精品亚洲成在人线,久久国产精品久久精品国产,熟妇与小伙子matur老熟妇e,久久久久麻豆v国产精华液好用吗,色一乱一伦一图一区二区精品,精品国产成人亚洲午夜福利,精品久久亚洲中文无码,99久久免费看少妇高潮a片特黄,国产欧美日韩视频一区二区三区

  • <fieldset id="iyu28"><table id="iyu28"></table></fieldset>
    <strike id="iyu28"></strike>
  • <ul id="iyu28"></ul><ul id="iyu28"><dfn id="iyu28"></dfn></ul>

      Home & Garden Sundries Supplier

      WeChat

      Why does the tin barrel need to be galvanized?

      2021-01-06 417

      Many friends in the process of using the iron bucket, will find that the appearance of the iron bucket is galvanized, so, do you know why the iron bucket is galvanized? Let's see the detailed introduction of Xiaobian.

      Barrel manufacturers think that zinc: zinc soluble in acid, but also soluble in alkali, so it is called amphoteric metal. Zinc hardly changes in dry air. In humid air, a fine basic zinc carbonate film will be formed on the surface of zinc. In the atmosphere containing sulfur dioxide, hydrogen sulfide and marine, the corrosion resistance of zinc is poor, especially in the atmosphere containing organic acid at high temperature and high humidity.

      江門外貿(mào)鐵皮桶

      The standard electrode potential of zinc is -0.76v. For steel substrate, zinc coating belongs to anodic coating, which is mainly used to avoid corrosion of steel. Its protective function is closely related to the thickness of coating. The protective and decorative properties of zinc coating can be significantly improved after passivation, dyeing or coating with light protecting agent.

      The principle of galvanizing process: in a rotating barrel with plating parts, glass balls, zinc powder [color business opportunities: zinc powder standard], water and additives, the glass ball as the impact medium rotates with the barrel, conflicts with the surface of the plating parts and generates mechanical and physical energy by hammering. Under the effect of chemicals, the coated zinc powder is "cold welded" to the surface of the plating parts to form lubrication, uniformity and stability As thick as possible.

      Article source: Jiangmen foreign trade iron bucket http://m.thefriendsco.com/


      Recommended news
      亚洲爆乳少妇无码激情| 亚洲av区,一区二区三区色婷婷 | 国产自拍视频免费在线| 黑色丝袜秘书夹住巨龙摩擦| 久久国产A√无码专区亚洲| 国产日韩午夜视频在线观看| 亚洲人成网站久久久综合| 国产大片在线观看91| 蜜桃视频在线看一区二区三区 | 多毛小伙内射老太婆| 激情偷乱人成视频在线观看| 亚洲两性视频一三区| 日本一区二区午夜视频| 丰满人妻熟妇乱又仑精品| 精品久久久久久久久久中文字幕| 性一交一乱一伦一视频一二三区| 亚洲精品中文字幕熟女| 国产成人亚洲精品无码青| 鸭子tv国产在线永久播放 | 亚洲欧美日韩精品高清| 亚洲精品一区二区三区在线观| 亚洲精品av一区二区| 2018国产精华国产精品| 久久99国产伦精品免费| 日本高清无卡一区二区三区| 无码少妇丰满熟妇一区二区| 激情 人妻 制服 丝袜| 91精品国产闺蜜国产在线| 亚洲国产免费不卡视频| 久久精品国产亚洲av电影网| 亚洲国产福利精品一区二区| 91久久精品一二三区色| 日本真人边吃奶边做爽电影| 八戒网站免费观看视频| 日日噜噜夜夜狠狠久久av| 日本久久精品中文字幕| 在线精品国产一区二区三区| 成年女人在线观看毛片| 高清少妇二区三区视频在线观看 | 久久99精品久久久久九色 | 亚洲黄片av在线播放|