Purmuring, cleaning, flushing, soaking solvent, drying. The welded pipe is suspended from the driving to the pickled tank for pickling (about 2 tons of each hanging).
About 26%of the hydrochloric acid solution pickled out. In order to prevent excessive pickling and volatilization of acid mist, add 0.5 ~ 1.0g/L composite and fogotic agent to the acid washing agent, which is picked in normal temperature. For 30 to 60 minutes, in order to make the steel pipe evenly pick up, the steel pipe is lifted 2 to 3 times during the picking process to improve the pickling effect. When the acid liquid concentration drops to 100g/L, it should be supplemented or replaced, and the iron content reaches 220 ~ 260g/L as waste acid emissions.
The pickled steel pipe is suspended from the driving to the cleaning tank to clean it to remove the residual acid and iron salt accumulated on the surface of the steel pipe. The steel pipe is suspended in the solvent groove, and the dipping time is 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 pre -plating effect in the solvent of the steel pipe, the solvent always maintains weak alkaline, and then hangs from driving to the dry furnace frame into the dry furnace to dry. The drying temperature is 100 ~ 130 degrees, and the time is generally 6 ~ 10 minutes.
The biggest advantage of galvanized sulfate galvanized galvanized pipes is that the current efficiency is as high as 100% and the deposition rate is fast. This is unparalleled by other galvanized processes.
Optimization of sulfate galvanized pipes:
Due to the insufficient crystals of the plating, and poor decentralized ability and deep plating ability, it is only suitable for electroplating such as pipes with simple geometric shapes and threads. The sulfate -galvanized iron alloy process is optimized to the traditional sulfate galvanized galvanized process. Only zinc sulfate is retained, and the remaining components are abandoned. Add an appropriate amount of iron salt to the formation of a new process formula, so that the original single metal coating forms zinc iron alloy plating.
The reorganization of the process not only promotes the advantages of high original process current efficiency and fast deposition rate, but also greatly improves the decentralized and deep -plating ability. In the past, complex parts cannot be placed. 3 to 5 times more than single metals. Production practice has proved that it is used for continuous plating of wires and pipes. The plating grain grains are more refined, brighter than the original, and faster sedimentary rate. 2 ～ MIN's internal plating thickness meets the requirements.
