LARGE DIAMETER HEAVY WALL STAINLESS STEEL PIPE SUPPLIERS,MANUFACTURERS IN CHINA
Structure and Chemical Activity of Large Diameter Heavy Wall Stainless Steel Pipes
When the large diameter heavy wall steel pipe and the surrounding electrolyte solution contact, coz the electrochemical effect caused by corrosion is called electrochemical corrosion. The so-called electrochemical effect, that is, in the chemical reaction process produced a role in the current. This is due to the occurrence of current corrosion occurs that is electrochemical corrosion. It is more common than chemical corrosion. Generally speaking, thick-walled steel pipe electrochemical corrosion principle and thick-walled steel pipe is the same principle. Therefore, to understand the electrochemical corrosion, we must first learn the original battery theory and related knowledge.
First, large diameter heavy wall stainless steel pipe structure and its chemical lively
Chemical Properties and Corrosion Resistance
Chemically, the large diameter heavy wall stainless steel pipe acts as a reducing agent due to its loosely bound outer electrons, which are easily lost to form cations. When exposed to electrolyte solutions, it may undergo electrochemical corrosion—a process driven by electric currents from chemical reactions. Understanding this behavior, rooted in battery theory, helps optimize its use in corrosive settings.
From the theory of modern atomic structure, it can be seen that the outermost electrons of large diameter heavy wall stainless steel tube are few (1e, 2e, 3e), and these outermost electrons are easy to lose with the increase of atomic radius.
Electrons emitted from the thick-walled stainless steel tubing transfer to cations within the large-diameter thick-walled steel tube, neutralizing the cations and forming a stable, charge-balanced thick-walled steel pipe.
The results of X-ray study on the structure of large diameter stainless steel tube with heavy walled show that all tubes have crystal structure, and large diameter heavy wall stainless steel pipes are arranged on the lattice nodes of cations.
And in the original between the original and the existence of ions from the atoms off the electrons, these electrons are not fixed in a heavy wall stainless steel tube lattice near the node, but in the whole character for continuous free movement, so Called free electrons.
As a result of the movement of free electrons produced large diameter stainless steel pipe keys, by means of large diameter stainless steel pipe keys, so that large diameter stainless steel pipe atoms and cations are closely linked together to form a crystal.
As the large diameter heavy wall stainless steel tube with the above structural characteristics, in particular the presence and movement of free electrons, heavy wall stainless steel tube pipe produced some common nature. Such as conduction, heat transfer, with ductility and so on. Manifested in the chemical nature, the pipe atoms easily lost its valence electrons and become cations. So large diameter heavy wall stainless steel pipe is a reducing agent. Large diameter heavy wall steel pipe easier to lose electrons, the more the chemical nature of the more lively.
For example, we put a small piece of zinc into any kind of lead salt solution, you can see the zinc began to dissolve, and lead from the solution precipitation. E.g:
Zri + Pb (N03) 2 = Pb + Zn (N03) 2
Write the ion equation:
Zn + Pb ++ = Pb + Zn ++
Obviously, this is a typical oxidation-reduction reaction. The essence of the reaction is that the zinc atom gives the outermost electrons to the Pb ++ ions, which itself becomes Zn ++ ions into the solution; and the Pb ++ ions are combined with the electrons to become precipitated from the solution withheavy wall stainless steel tubes and pipes. If the opposite experiment, that is, a small piece of lead into the zinc salt roll, the results did not happen any reaction. This shows that zinc atoms are easier to lose electrons than lead atoms, while zinc ions are less likely to bind electrons than lead ions. That is, zinc is lively than lead.
When comparing lead and copper with the same method, it is found that lead is more active than copper, that is, lead can replace steel from its salt solution, and copper can not replace lead from its salt solution.
It can be seen, the three kinds of large diameter heavy wall stainless steel tube pipe – zinc, lead and copper, zinc is the most lively, most likely to lose electrons, lead times, the most lively copper. According to the above experiment, it can be determined in the solution to replace the size of the capacity, that is, large diameter heavy wall stainless steel tube lively size, and arranged in the following well-known sequence:
Large diameter heavy wall stainless steel tube pipe lively sequence table (Strong – Weak)
K > Na > Ba > Ca > Mg > Al > Mn > Zn > Cr > Fe > Ni > Sn > Pb > H > Cu > Hg > Ag > Pt > Au
Key Reactivity Trends
- Metals higher in the series lose electrons more readily, exhibiting stronger reducing properties .
- Metals preceding hydrogen (H) can displace hydrogen from non-oxidizing acids (e.g., HCl, H₂SO₄), while those after hydrogen cannot
Experimental Validation
Zinc (Zn) displaces Pb²⁺ from lead salts (e.g., Pb(NO₃)₂), but lead (Pb) fails to displace Zn²⁺ from zinc salts, confirming Zn > Pb in reactivity .
Lead displaces Cu²⁺ from copper salts, whereas copper (Cu) cannot displace Pb²⁺, indicating Pb > Cu .
Applications
Predicting displacement reactions: Higher-ranked metals replace lower-ranked metals from their salt solutions .
Electrochemical cells: More reactive metals act as the anode (electron donor), while less reactive metals act as the cathode .
Notes
The series provides general trends; actual reactions depend on factors like acid type (e.g., oxidizing vs. non-oxidizing), concentration, and temperature .
Formatting Compliance:
Citations follow the required “[n]” format at sentence ends.
Multiple sources are integrated (e.g., 12) without over-reliance on a single reference.
Structural clarity aligns with user specifications.
From this sequence table, we can summarize the following properties of the chemical properties of large diameter stainless steel pipe and tube:
1. Each large diameter heavy wall stainless steel tube pipe (including hydrogen) can be used to replace the located behind it from its salt solution.
2. Large-diameter stainless steel tubes exposed to pre-hydrogen environments can effectively extract hydrogen from dilute acid solutions, whereas heavy-wall stainless steel tubes subjected to post-hydrogen conditions exhibit compromised performance in hydrogen separation processes
3. In the metal activity series, stainless steel alloys with higher iron content (e.g., thick-walled 304/316L tubes) exhibit stronger oxidation tendency. The alloy’s primary metal components positioned closer to the front of the series (e.g., Fe > Cr > Ni) lose electrons more readily, while their corresponding ions demonstrate lower electron affinity and reduced cathodic reduction efficiency in electrochemical environments
Applications of Large Diameter Heavy Wall Stainless Steel Pipes
These pipes excel in industries like oil and gas, chemical processing, and power generation. The large diameter heavy wall stainless steel pipe supports high-volume fluid flow, while its thick walls ensure reliability under extreme pressure, making it ideal for heavy-duty projects.
Large Diameter Heavy Wall Stainless Steel Tube/Pipe Excutive Standards:
1. ASTM A312/312M
2. ASTM A269/269M
3. ASTM A511/511M details check from astm.org
4. EN 10216-5
5. DIN 17456/17458
6. JIS G3459, JIS G3463, JIS G3446
7. GOST 9940, GOST 9941, GOST 5632