Copper pipes have become an indispensable part of people's lives. Today, the editor will explain the structure of the copper pipe and the anti-corrosion method!

Three structures of copper tube

Copper alloys of various compositions have different crystallization characteristics, different casting properties, and different casting process characteristics.

1. Tin bronze: The crystallization characteristic is that the crystallization temperature range is large and the solidification area is wide; the casting performance is poor fluidity, easy to produce shrinkage, and not easy to oxidize; the process characteristic is that the thick wall parts adopt directional solidification.

2. Aluminum bronze and aluminum brass: the crystallization characteristic is that the crystallization temperature range is small, which is the characteristic of layer-by-layer solidification; the casting performance is good fluidity, easy to form concentrated shrinkage cavity, and easy to oxidize; the process characteristic is that the aluminum bronze casting system is the bottom The injection type, the aluminum brass gating system is an open type.

3. Silicon brass: The crystallization characteristic is between tin bronze and aluminum bronze; the casting performance is the best; the technological characteristic is the sequential solidification process.

What are the anti-corrosion methods for copper pipes?

Specifically: coating the pipe layer with asphalt paint; cement mortar lining special coating; coating the pipe layer with epoxy coal tar pitch; epoxy ceramic lining; aluminate cement coating and sulfate cement coating; coating with polyurethane Tube layer and so on.

The application of copper pipe has exceeded the utilization rate of iron

Iron can be seen everywhere in life, and its application is very wide, ranging from buildings and halls to stoves and kitchen utensils. But now, in real life, the application of copper tube is also very extensive, even surpassing the use of iron.

The application of copper tubes is much wider than that of pure iron. Every year, 50% of copper is electrolytically purified into pure copper, which is used in the electrical industry. The copper tube mentioned here must contain more than 99.95% copper, because impurities such as phosphorus, arsenic, and aluminum will greatly reduce the conductivity of copper. In addition, impurities such as lead, antimony, and bismuth will prevent the copper crystals from being combined, causing thermal embrittlement, and also affecting the processing of copper.

Such high-purity copper tubes are generally refined by electrolysis: impure copper is used as anode, pure copper is used as cathode, and copper sulfate solution is used as electrolyte. When the current is passed, the impure copper on the anode gradually melts, and the pure copper gradually precipitates on the cathode. The purity of the copper obtained in this way can reach 99.99%.