【Daily Question】12.23 Classification of metal corrosion (Reply +3 points; correct answer +3–8 points)
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This post was last edited by lzy4225925 on 2016-1-2 at 10:57. Topic: Briefly answer: Based on the classification criteria for the forms of metal corrosion and failure, list at least five types of metal corrosion ①General corrosion ② Galvanic corrosion ③ Pitting corrosion ④ Crevice corrosion ⑤ Selective corrosion ⑥ Intergranular corrosion ⑦ Wear corrosion ⑧ Stress corrosion ⑨ Corrosion fatigue ⑩ Hydrogen damage. Requirements and hints for answering the question: Requirement: List at least five types. Hint: Classify them by form of corrosion. Note: We will close this thread after 24 hours, and at that time we will announce the best response (the most helpful answer), along with the correct answers and explanations. Other details: Recruitment for moderators & technicians in the [Mechanical Section] – applications and referrals are welcome. 【Valid indefinitely】【If you’re interested, come ahead!】 】(Click to enter) 【Mechanical Zone】Comprehensive guide to preventing equipment freezing over the winter 【Mechanical Zone】Call for collection of essential knowledge 【Seeking manufacturer sponsors】(Ongoing campaign) 【Rewards for recommending valuable content; the “Active Users and Weekly Stars” competition in the Mechanical Zone has begun】
Classified by corrosion pattern: 1. General corrosion or uniform corrosion; 2. Local corrosion, including pitting corrosion, spot corrosion, crevice corrosion, intergranular corrosion, exfoliation corrosion, selective corrosion, and filamentary corrosion. 3. Corrosion under stress includes stress corrosion cracking, hydrogen embrittlement and hydrogen-induced cracking, corrosion fatigue, wear corrosion, cavitation corrosion, and microvibration corrosion.
Crevice corrosion, intergranular corrosion, pitting corrosion, stress corrosion cracking, electrochemical corrosion, chemical corrosion, general corrosion.
pitting corrosion, crevice corrosion, intergranular corrosion, stress corrosion, fatigue corrosion, hydrogen embrittlement, etc
Classification of corrosion: (1) By the environment in which corrosion occurs: corrosion in natural environments and industrial environments; (2) By material: corrosion of metals and non-metals; (3) By corrosion mechanism: chemical, electrochemical, and physical corrosion; (4) By the pattern of metal degradation due to corrosion and the distribution of the corroded areas: it is divided into general corrosion and local corrosion; (5) By temperature: high-temperature corrosion and room-temperature corrosion
Galvanic corrosion, pitting corrosion, crevice corrosion, selective corrosion, electrochemical corrosion..........
Pitting corrosion, crevice corrosion, stress corrosion, fatigue corrosion, intergranular corrosion, uniform corrosion, wear corrosion, etc.
Please list at least five types of metal corrosion based on the classification criteria for the forms of metal corrosion damage Based on the patterns of metal corrosion failure, metal corrosion is classified into (1) stress corrosion cracking: it ranks first among local corrosion types due to its severe destructive effects. The characteristics of cracks vary depending on the properties of the corrosive medium and the stress conditions. (2) Pitting corrosion: This type of damage occurs primarily at certain active sites and progresses deep into the metal. Typically, the depth of pitting corrosion is greater than its pore diameter. In severe cases, it can cause the pipe to perforate. (3) Intergranular corrosion: This type of corrosion occurs first at the grain boundaries and then progresses deeper along those boundaries. After corrosion occurs, although no obvious changes can be seen in the appearance of the metal, its strength has been significantly reduced. Petroleum Talent Network (4) Electrode couple corrosion: Electrochemical corrosion that occurs when metals with different electrode potentials come into contact with each other in a certain medium is considered electrode couple corrosion. (5) Crevice corrosion: This type of corrosion occurs in crevices containing corrosive agents, and can, in severe cases, penetrate the metal plate.
Surface corrosion and local corrosion. Local corrosion can be divided into eight categories: pitting corrosion, crevice corrosion, galvanic corrosion, intergranular corrosion, selective corrosion, wear corrosion, stress corrosion, and corrosion fatigue ； General corrosion is also known as uniform corrosion
Uniform corrosion, intergranular corrosion, stress corrosion, pitting corrosion, crevice corrosion
pitting corrosion, crevice corrosion, stress corrosion, intergranular corrosion, uniform corrosion, wear corrosion,