因應經濟建設的需求，加上要提高空間利用率，縮短工期，以及達到防震和節省成本等要求，鋼結構物的建造逐年增加，然而鋼材卻存有易生銹的缺點，因此許多防蝕方法即因應而生。本文則以曝露於大氣的鋼樑應如何施以塗裝防蝕做一介紹，其中就塗裝系統的選用細分成不同位置和不同環境的需求，同時介紹了塗裝工程在鋼廠、鋼結構廠和現場架設時之搭配以及底材的前處理，以供相關業者參考。

In order to meet the demand of economy construction, earthquake resistance, cost saving, increase of exercise space, reduction of construction period etc., steel constructions have gradually increased year by year. However, easy rusting remains the main short-coming of steel. Many anti-corrosion methods have been developed and criticized. In this paper, how to prevent steel bridge from corrosion by painting is introduced. The selection of painting systems for different area in different envrionments is described. In addition, how to coordinate the painting engineering among steel factories, steel construction plants and fields, and to prepare the steel surface are also described. These informations will provide a reference for relevant workers.