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.

为了保证装饰涂（镀）层与铁艺制品表面有良好的结合力，必须在涂（镀）实施之前，对铁艺制品表面的氧化皮、焊渣、锈痕、油脂、脏物、水份进行尽可能的清除，否则易造成涂（镀）层起泡、开裂、起层及剥落等现象。所谓的予处理就是指用机械或者化学、电化学等工艺方法来消除铁艺制品涂（镀）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、去锈、清除氧化皮焊渣的主要方法有手工处理、机械处理、喷射处理、化学处理（酸洗）、电化学处理和火焰处理等方法。

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.

手工处理主要使用砂布，刮刀，锤凿、钢丝刷、废砂轮等工具，靠手工打磨敲铲、扫刷来除去锈垢、氧化皮及焊渣，尘土等表面污物。

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.

机械处理更常用的有风（电）动刷，除锈枪，抛光砂轮及风（电）铲等工具，借助机械力的高频冲击与磨擦的作用除锈和清除氧化皮旧漆等污物。  喷射处理是利用机械离心、压缩空气、高压水流等为动力，将磨料、砂石、钢丸抛射到铁艺制品的表面，冲击和磨擦掉氧化皮、锈痕、旧漆、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.

化学处理是利用特殊配方的酸性溶液来浸、溶铁艺制品，通过化学反应来除净氧化皮、锈痕、油污，即所谓的“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、除油对于铁艺制品来讲，一般可采用有机溶液，碱液，电化学等方法，市面所售的各种金属清洗剂也较适用。

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.