The decorative effect paint on the surface of high-grade iron guardrail is rich and colorful. Most of them are hand-painted with imported paint, which is simple, elegant, fashionable and fashionable. Classic surface decoration effects include bronze, red bronze, bronze gold, black gold, copper gold, platinum and so on.

為了保證裝飾涂（鍍）層與鐵藝制品表面有良好的結合力，必須在涂（鍍）實施之前，對鐵藝制品表面的氧化皮、焊渣、銹痕、油脂、臟物、水份進行盡可能的清除，否則易造成涂（鍍）層起泡、開裂、起層及剝落等現(xiàn)象。所謂的予處理就是指用機械或者化學、電化學等工藝方法來消除鐵藝制品涂（鍍）前的表面缺陷。

In order to ensure a good adhesion between decorative coating (plating) and the surface of iron products, the oxide scale, welding slag, rust mark, grease, dirt and water on the surface of iron products must be removed as much as possible before the coating (plating) is carried out, otherwise it is easy to cause blistering, cracking, peeling and other phenomena. The so-called pretreatment refers to the use of mechanical or chemical, electrochemical and other process methods to eliminate the surface defects of iron products before coating (plating).

1、去銹、清除氧化皮焊渣的主要方法有手工處理、機械處理、噴射處理、化學處理（酸洗）、電化學處理和火焰處理等方法。

1. The main methods of removing rust and welding slag are manual treatment, mechanical treatment, spray treatment, chemical treatment (acid pickling), electrochemical treatment and flame treatment.

手工處理主要使用砂布，刮刀，錘鑿、鋼絲刷、廢砂輪等工具，靠手工打磨敲鏟、掃刷來除去銹垢、氧化皮及焊渣，塵土等表面污物。

Manual treatment mainly uses abrasive cloth, scraper, hammer chisel, steel wire brush, waste grinding wheel and other tools. It uses manual grinding, shoveling and sweeping to remove rust, oxide scale, welding slag, dust and other surface dirt.

機械處理更常用的有風（電）動刷，除銹槍，拋光砂輪及風（電）鏟等工具，借助機械力的高頻沖擊與磨擦的作用除銹和清除氧化皮舊漆等污物。  噴射處理是利用機械離心、壓縮空氣、高壓水流等為動力，將磨料、砂石、鋼丸拋射到鐵藝制品的表面，沖擊和磨擦掉氧化皮、銹痕、舊漆、型砂等。

The most commonly used tools for mechanical treatment are wind (electric) brush, derusting gun, polishing wheel, wind (electric) shovel, etc. with the help of high frequency impact and friction of mechanical force, derusting and removing dirt such as oxide skin and old paint are carried out. Jet treatment is the use of mechanical centrifugation, compressed air, high-pressure water flow as the power, the abrasive, sand, steel shot shot shot to the surface of iron products, impact and friction off oxide scale, rust marks, old paint, molding sand, etc.

化學處理是利用特殊配方的酸性溶液來浸、溶鐵藝制品，通過化學反應來除凈氧化皮、銹痕、油污，即所謂的“酸洗”。

Chemical treatment is the use of special formula of acid solution to soak, dissolve iron products, through chemical reaction to remove oxide scale, rust, oil, that is the so-called "pickling".

2、除油對于鐵藝制品來講，一般可采用有機溶液，堿液，電化學等方法，市面所售的各種金屬清洗劑也較適用。

2. For iron products, organic solution, alkaline solution and electrochemical method can be used to remove oil. Various metal cleaning agents on the market are also suitable.