多数金屬,尤其是铁,在空气和水的作用下,会發生腐蝕現象,就是生銹。生锈会使铁损坏,成为廢鐵。电桿、鋼窗、桥梁鋼架,一切曝露在空气里的铁制品上,經常用塗料來保护。塗料是用干性油、底料和色料調合而成,目 Most metals, especially iron, will undergo corrosion under the influence of air and water, which is rust. Rusty can damage iron and become scrap iron. Electric poles, steel windows, and steel bridges, all exposed to iron in the air, are often protected by paint. The coating is made by blending dry oil, primer and colorants.