Hebei Borui Pipeline Equipment Co., Ltd

That is, pickling, cleaning, rinsing, immersion in solvents, drying. The welded pipe is lifted from the car to the pickling tank for pickling (about 2 tons per lift). About 26% hydrochloric acid solution for pickling, in order to prevent excessive pickling and acid mist volatilization, add 0.5~1.0g/L corrosion inhibitor and fog inhibitor in the pickling solution, pickling at room temperature, pickling time is generally 30~60 minutes, in order to make the steel pipe can be evenly pickled, in the pickling process using a crane to lift the steel pipe 2~3 times to improve the pickling effect.

When the acid concentration drops to 100g/L, it should be supplemented or replaced, and the iron content reaches 220~260g/L as waste acid discharge. The pickled steel pipe is hoisted to the cleaning tank by car for cleaning to remove the residual acid and iron salts accumulated on the surface of the steel pipe after pickling, and then hoisted to the washing bench to rinse with 0.7~0.8Mpa clean water, after the water droplets dry, the steel pipe is hoisted to the solvent tank for dipping, dipping time for about one minute, the solvent uses 600~650g/L zinc chloride and 80~100g/L ammonium chloride and 1~2g/L OP-10 surfactant.

In order to improve the solvent pre-plating effect of the steel pipe, the solvent always remains weakly alkaline, and then it is hoisted by the car to the drying furnace bench into the drying furnace for drying, the drying temperature is 100~130 degrees, and the time is generally 6~10 minutes.The biggest advantages of sulfate galvanized pipe are that the current efficiency is as high as 100% and the deposition rate is fast, which is unmatched by other galvanizing processes.

Steel pipes need to be treated before galvanizing

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