Large diameter seamless tube structure and its chemical activity analysis

The corrosion caused by the electrochemical action of large diameter seamless pipe in contact with the surrounding electrolyte is called electrochemical corrosion. The so-called electrochemical action is the role of generating electric current in the process of chemical reaction. This kind of corrosion due to electric current is electrochemical corrosion. It is more common than chemical corrosion. Generally speaking, the principle of electrochemical corrosion of large diameter seamless pipe is the same as that of primary cell of large diameter seamless pipe. Therefore, to understand electrochemical corrosion, you must first learn the theory of primary battery and related knowledge.

First, the structure and chemical activity of large-diameter seamless tube

From the modern atomic structure theory, due to the large diameter of the seamless tube, the number of outermost electrons in an atom is small (1,2,3e e e), and with the increase of the atomic radius, the outermost electrons are easily lost. When electrons leave a large diameter seamless tube atom, the large diameter seamless tube atom becomes a large diameter seamless tube cation, and when electrons leave a large diameter seamless tube cation, it now becomes a neutral large diameter seamless tube atom.

The structure of large-diameter seamless tubes was studied with x-rays, and the results proved that all large-diameter seamless tubes have a crystalline structure, with large-diameter seamless tubes and large-diameter seamless tubes cation atoms lining the large-diameter seamless tube lattice points. Between the atomic electrons of the ions present between the original to and away, these electrons are not fixed on the dotted nodes near the large-diameter seamless tube, but move freely throughout the interworking of the character, and are therefore called free electrons. Due to the free movement of electrons large-diameter seamless tubes are created, and with the help of large-diameter steel tube bonds, atoms and cations are tightly connected together in large-diameter seamless tubes, forming large-diameter seamless tubes crystals. Due to the above structural characteristics, especially the presence and movement of free electrons, large diameter seamless steel tubes have some common properties. Such as conduction, heat transfer, ductility, etc. In terms of chemical properties, large-diameter seamless tube atoms easily lose valence electrons and turn into cations. Therefore, large diameter seamless tube is a water-reducing agent. The easier large seamless tubes lose electrons, the more chemically active they are.

For example, if we put a small piece of zinc into any lead salt solution, we can see that the zinc starts to dissolve and the lead dissolves from the solution. For example:

Zri + Pb (N03) 2 = Pb + Zinc (N03) 2

Write it as an ionic equation:

Zn+ Pb++ = Pb+ Zn++

Clearly, this is a typical redox reaction. The essence of the reaction is that the zinc atom gives its outermost electron to the Pb++ ion, and the Pb++ ion becomes the Zn++ ion into solution. On the other hand, the Pb++ + ions combine with the electrons to form large seamless lead tubes that precipitate out of the solution. If you do the opposite experiment and you put a small piece of lead into the zinc salt solution, nothing happens. This means that zinc loses electrons more readily than lead, and zinc ions are less likely to bind electrons than lead. So zinc is more active than lead.

If the same method is used to compare the activity of lead and copper, it is found that lead is more active than copper and brass, where lead replaces the salt solution of steel, while copper is not displaced by the salt solution of lead.

It can be seen that among the above three types of large-diameter seamless tubes - zinc, lead and copper - zinc is the most active and loses the most electrons, lead is the second and copper the least. According to the above experiments, it can be seen that the size of the mutual substitution ability of large-diameter seamless tubes in solution is, and the size of the activity of large-diameter seamless tubes can be determined.

Large-diameter seamless tube activation order table

K, Na, Ca, Mg, Ba, Al, Mn, zn, Cr, Fe, Ni, Sn, Pb, H, Cu, Hg, Ag, Pt, Au

The ability of large diameter seamless tube to lose electrons in solution (the activity and reduction ability of large diameter seamless tube) is weakened

From this number list, we can summarize the chemical properties of large-diameter seamless tubes as follows:

1. large diameter seamless tubes (containing hydrogen) in the large diameter seamless tubes activation sequence list from their salt solutions can replace the large diameter seamless tubes that follow them

2. large-diameter thick-walled tubes in front of hydrogen can replace hydrogen in dilute acids, while large-diameter seamless tubes behind hydrogen cannot

3. The more active the large-diameter seamless tube in front of it in the ordinal list, the greater the possibility of its atoms losing electrons and the greater the difficulty of ion binding