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Corrosion is a term used to describe the reactions that occur between a material and its surrounding environment, which result in significant changes in the material and damage to the material. In the presence of metal materials and aqueous solutions, the reaction usually has electrochemical characteristics. In addition, simple chemical reactions or pure physical processes may occur. Not every reaction process leads to material damage. This is a question of the degree of reaction and the functional requirements of the material or medium, both of which should be considered together. When such a function is broken, it is a sign of failure. Corrosion protection is designed for this harmful effect.
Material migration and chemical reactions can provide or eliminate important reaction components. In addition to adsorption and desorption, phase boundary reactions involving and affected by external current will occur in most electrochemical reactions. The components involved in the hydrogen reaction can be produced by the cathodic process. Hydrogen can also penetrate the microcrystalline structure of metals, and physical or chemical reactions occur in this structure, resulting in the loss of mechanical properties. In this type of corrosion, cracks are formed during mechanical testing, causing the metal material to fracture without causing any loss.
The failure types can be divided into uniform corrosion or local metal spalling, corrosion cracking or corrosion products with harmful effects on the environment. Local erosion may be pitting, pitting and selective dissolution or cracking of small area microcrystalline structure. The harmful influence of buried pipeline is not considered, but the environment of tank container must be fully considered.
In general, different reaction results lead to some form of corrosion and can be classified according to the specific type of corrosion. The most important ones are uniform corrosion, corrosion resistance, pitting corrosion, crevice corrosion, intergranular corrosion, stress corrosion and corrosion fatigue related to mechanical action. The latter two are most worrying. Most of the corrosion damage is caused by pitting. Uniform corrosion usually occurs, but rarely causes corrosion damage.
Shandong Linyi Bosi conductive materials Co., Ltd. is a high-tech enterprise specializing in the production of MMO flexible anode, conductive polymer flexible anode and titanium coated anode, mainly providing cathodic protection technology, engineering design, installation and technical services.