Do you know the process characteristics of galvanized pipe? Next, let's introduce it to you.
Optimization of sulfate zinc plating
The biggest advantage of sulfate zinc plating is that the current efficiency is up to 100%, and the stacking speed is fast, which is unparalleled in other zinc plating processes. Because of the poor crystallization of the coating, the poor dispersion ability and deep plating ability, it is only suitable for the plating of pipes and wires with simple geometry. The traditional process of sulfate galvanizing is optimized by the process of sulfate galvanizing iron alloy. Only the main salt zinc sulfate is retained, and the rest components are abandoned. In the new process formulation, a proper amount of iron salt is added to make the original single metal coating form a zinc iron alloy coating. The reorganization of the process not only develops the advantages of high current efficiency and fast stacking speed of the original process, but also greatly improves the lax ability and deep plating ability. In the past, miscellaneous parts could not be plated, but now both simple and miscellaneous parts can be plated, and the protection function is 3-5 times higher than that of single metal. The production practice shows that the coating grain is finer, brighter and faster than the original one when it is used for continuous plating of wire and pipe. The coating thickness can meet the requirements within 2-3 minutes.
Conversion of sulfate zinc plating
Only the main salt zinc sulfate of sulfate galvanizing is retained in the sulfate electrogalvanizing ferroalloy, and other components such as aluminum sulfate and alum (aluminum potassium sulfate) can be removed by adding sodium hydroxide to form insoluble hydroxide during the bath treatment; for organic additives, they can be removed by powder active carbon adsorption. The test shows that aluminum sulfate and aluminum potassium sulfate can not be removed completely at one time, which has an impact on the brightness of the coating, but it is not serious, and can be brought out for consumption. At this time, the brightness of the coating can be recovered after the solution is treated, and can be added according to the content of components required by the new process, that is, the completion of transformation.
Fast stacking speed and excellent protection function
The current efficiency of the process is as high as 100%, and the fast stacking rate is unparalleled in any galvanizing process. The operation speed of the fine tube is 8-12m / min, and the thickness of the coating is even 2m / min, which is difficult to achieve in continuous galvanizing. The coating is bright and delicate. According to the national standard GB / t10125 "artificial atmosphere test - salt spray test", the coating is free of defects and changes in 72h; 96h, the coating surface shows a small amount of white rust.
Unique clean production
The galvanizing pipe adopts the sulfate galvanizing ferroalloy process, which means that the production line slot and the slot are all perforated and straight without any solution out or overflow. Each process in the production process is composed of a circulating system. Each bath solution, i.e. acid-base solution, electroplating solution, discharge light and passivation solution, is recycled only and does not leak or discharge to the outside of the system. The production line is only equipped with five cleaning tanks, which are periodically discharged by recycling, especially the production process without waste water after passivation.
Particularity of electroplating equipment
The copper plating of galvanized pipe is the same as that of continuous plating, but the plating equipment is different. Wire with its long and thin strip characteristics and planning of the plating tank, the tank is long and wide but shallow. During electroplating, the iron wire passes through the hole and unfolds in a zigzag shape on the liquid surface to keep mutual distance. The galvanized pipe is different from the iron wire, with its unique features, and the groove equipment is relatively messy. The tank body is composed of upper part and lower part. The upper part is a plating tank and the lower part is a solution circulation storage tank, which forms a narrow upper and wide lower, trapezoid like tank body. In the plating tank, there is a channel for galvanizing pipe electroplating operation. At the bottom of the tank, there are two through holes connected with the lower storage tank, and the tank and the lower pump form a plating solution circulation reuse system. Therefore, the galvanized pipe is dynamic like the iron wire plating, and the plating solution of galvanized pipe is also dynamic.
This article is provided by Jinan galvanized pipe manufacturer. The above is a detailed introduction to the welding skills of Jinan galvanized pipe. To learn more, please click http://jnlhjscl.com