Knowledge

26Oct, 2024

What is the impact of the content of ferric chloride (and ferrous chloride) i...
It is known that when hydrochloric acid solution is used for pickling steel pipes, industrial hydrochloric acid is directly used for this purpose, which allows for a faster picklin
26Oct, 2024

What are the advantages and disadvantages of pickling steel pipes in hydrochl...
The pickling process is relatively fast; There is less erosion to the base metal of the steel pipe, thus saving steel consumption; Hydrogen diffuses less into the base metal of the
25Oct, 2024

What are the optimal temperature and concentration for acid pickling?
When the concentration increases from 2% to 25%, the pickling rate of hydrochloric acid solution increases by 10 times. When hydrochloric acid solution is used for pickling steel t
25Oct, 2024

Why is acid pickling necessary for steel tube billets?
The purpose of acid pickling steel tube billets is to remove the oxide scale formed on the steel tube itself and during welding. Even though some oxide scale may peel off when the
25Oct, 2024

What are the factors that affect the lifespan of hot-dip galvanized zinc coat...
(1) Thickness Factor Thickness Range: The thickness of hot-dip galvanized zinc coatings directly affects their lifespan. Generally, controlling the zinc coating thickness within th
25Oct, 2024

How does zinc coating provide corrosion protection?
Using a zinc coating to protect the underlying steel substrate from corrosion, or to minimize its exposure to corrosion, has proven to be highly effective in general atmospheric co
25Oct, 2024

What are the main factors determining the corrosion rate of zinc coatings?
The corrosion rate of zinc coatings varies depending on the nature of zinc salts (corrosion products) formed on the surface of the zinc coating in various situations. If the zinc s
25Oct, 2024

Why does the corrosion of the zinc coating initially occur faster than later on?
The newly hot-dip galvanized zinc coating lacks a protective layer on its surface, which results in a relatively fast corrosion rate. However, once a layer of corrosion products fo
24Oct, 2024

How does the zinc coating corrode in oilfields?
With the development of China's petroleum industry, galvanized steel pipes are increasingly used in oilfields for transporting crude oil. Therefore, the zinc coating undergoes
24Oct, 2024

How does the zinc layer corrode on buildings?
The corrosion of the zinc layer on buildings is related to the properties of the building materials. For example, cement and lime mortar have high alkalinity, which is highly corro
24Oct, 2024

How does the zinc layer corrode in soil?
The zinc layer can form a protective zinc carbonate layer in certain soils, providing anodic protection to the steel pipe substrate. However, this protective effect varies dependin
24Oct, 2024

How does the zinc layer corrode in seawater?
The salinity of seawater typically ranges from 1% to 25%, often approximated as 3.5% for calculations. Seawater contains substantial amounts of oxygen, nitrogen, carbon dioxide, an

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