也即酸洗、清洗、冲洗、浸涂溶剂、烘干。 焊管由行车吊至酸洗槽中停止酸洗(每吊 2 吨左右) 。26%左右的盐酸溶液停止酸洗，为 了避免过火酸洗和酸雾挥发，在酸洗液中添加 0.5~1.0g/L 的缓蚀剂和抑雾剂，常温停止酸洗， 酸洗时间普通为 30~60 分钟，为使钢管能平均酸洗，在酸洗过程中采用吊车将钢管起吊 2~3 次，以进步酸洗效果。当酸液浓度降落至 100g/L 时应补充或改换，含铁量到达 220~260g/L 作为废酸排放。
That is, pickling, cleaning, washing, dipping solvent, drying. Welded pipe is lifted from crane to pickling tank to stop pickling (about 2 tons per crane). About 26% of hydrochloric acid solution stops pickling. In order to avoid over-fire pickling and evaporation of acid mist, 0.5-1.0g/L corrosion inhibitor and mist inhibitor are added to the pickling solution. The pickling is stopped at room temperature. The pickling time is usually 30-60 minutes. In order to make the steel pipe pickling average, the steel pipe is lifted 2-3 times by crane in the pickling process to improve the pickling effect. When the acid concentration drops to 100 g/L, it should be replaced or replaced. The iron content reaches 220-260 g/L as waste acid discharge.
酸洗后的钢管由行车吊至清洗槽停止清洗以去除酸洗后积聚在钢管外表的残 酸和铁盐，然后吊至冲洗台架用 0.7~0.8Mpa 的清水冲洗，待水滴干后，将钢管吊至溶剂槽中 浸涂，浸蘸时间约一分钟，溶剂采用 600~650g/L 氯化锌和 80~100g/L 氯化铵以及 1~2g/L 的 OP-10 外表活性剂。为进步钢管的溶剂中预镀效果，溶剂一直坚持弱碱性，然后由行车吊至 枯燥炉台架进入枯燥炉内烘干，烘干温度 100~130 度，时间普通为 6~10 分钟。
Pipe after pickling is suspended from crane to cleaning tank to remove residual acid and iron salt accumulated on the surface of the pipe after pickling. Then it is suspended to the washing bench and washed with 0.7-0.8 Mpa clean water. After dripping, the pipe is suspended to the solvent tank for dipping for about one minute. The solvent is 600-650 g/L zinc chloride, 80-100 g/L ammonium chloride and 1-2 g/L OP-10 surfactant. 。 In order to improve the effect of pre-plating in solvents for steel pipes, solvents are always weak alkaline, and then dried in the drying furnace from crane to drying furnace bench. The drying temperature is 100-130 degrees and the drying time is usually 6-10 minutes.
The greatest advantage of the optimized sulfate galvanized tube is that the current efficiency is up to 100% and the stacking rate is fast, which is incomparable with other galvanizing processes.
3. The optimization of sulfate galvanized tubes:
Because the coating crystallization is not meticulous enough, the dispersion ability and deep plating ability are poor, so it is only suitable for the electroplating of pipes and wires with simple geometry. The traditional sulfate zinc plating process was optimized by sulfate zinc-iron alloy plating process. Only the main salt zinc sulfate was preserved and the other components were discarded. In addition, proper amount of iron salt was added in the new process formulation to make the original single metal coating form zinc-iron alloy coating.
The process reorganization not only carries forward the advantages of high current efficiency and fast stacking rate of the original process, but also greatly improves the dispersion ability and deep plating ability. In the past, complex parts could not be plated. Now simple and complex parts can be plated, and the protective performance is 3-5 times better than that of single metal. Consumption theory proves that for continuous electroplating of wires and pipes, the grain size of the coating is finer, brighter and the deposition rate is faster than that of the original one. The coating thickness reaches the request within 2-3 minutes.
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