[Q&A Question 188] 2017.07.07
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This post was last edited by liuquan1100 on 2017-8-7 22:07. [Q&A Question 188] 2017.07.07: What is the mechanism of high-temperature hydrogen sulfide corrosion? The reference answers will be visible after responding; points are awarded by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Note: For questions of the type \"one question per day,\" if someone replies continuously for a month, that is, more than 30 posts, their score will be assigned as 2 points, which is the lowest possible score. Click once to reply; if multiple replies are made, points will be awarded as appropriate, as deleting posts is also a waste of time. High-temperature hydrogen sulfide corrosion is a type of uniform corrosion; it results from the reaction of iron with hydrogen sulfide to form ferrous sulfide and hydrogen gas. The corrosion rate is influenced by factors such as temperature and hydrogen sulfide concentration. Scoring criteria: 2 Wealth points for incorrect attempts; 3–8 points for *incomplete* answers. 10 Wealth points for correct answers, provided with detailed explanations; 15–20 Wealth points if the answer is correct but lacks sufficient details. Please score according to these criteria. Note: If there are editing records after answering, only those who participated will be given points. For continuous malicious spamming, 2 points will be deducted each time, with no upper limit. Pure numbers, pure emojis, or random letters unrelated to the answer are all considered malicious spamming; points will start to be deducted after three warnings. 2017 Q&A Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html Petrochemical Zone – “Creative Ideas for Energy Savings” campaign (the second phase is in full swing) http://bbs.hcbbs.com/thread-1666758-1-1.html (Source: Haichuan Chemical Industry Forum Website)
High-temperature hydrogen sulfide corrosion is a type of uniform corrosion; it results from the reaction of iron with hydrogen sulfide to form ferrous sulfide and hydrogen gas. The corrosion rate is influenced by factors such as temperature and hydrogen sulfide concentration.
High-temperature hydrogen sulfide corrosion is a type of uniform corrosion; it results from the reaction of iron with hydrogen sulfide to form ferrous sulfide and hydrogen gas. The corrosion rate is influenced by factors such as temperature and hydrogen sulfide concentration.
High-temperature hydrogen sulfide corrosion is a type of uniform corrosion; it results from the reaction of iron with hydrogen sulfide to form ferrous sulfide and hydrogen gas. The corrosion rate is influenced by factors such as temperature and hydrogen sulfide concentration.
High-temperature hydrogen sulfide corrosion is a type of uniform corrosion; it results from the reaction of iron with hydrogen sulfide to form ferrous sulfide and hydrogen gas. The corrosion rate is influenced by factors such as temperature and hydrogen sulfide concentration.
Hydrogen sulfide enters the gaps in the steel of the equipment pipelines, combines with iron ions to form iron sulfides, and releases hydrogen gas in the process
Hydrogen sulfide enters the gaps in the steel of the equipment pipelines, combines with iron ions to form iron sulfides, and releases hydrogen gas in the process
When processing sulfur-containing crude oil, uniform corrosion by high-temperature sulfur occurs in the high-temperature parts of the equipment (240–425°C). In the actual corrosion process, organic sulfides are first converted into hydrogen sulfide and elemental sulfur; these substances react directly with the surface of steel, causing corrosion. In an environment with a temperature of 375–425°C, the following reaction takes place: Fe + H2S → FeS + H2. Hydrogen sulfide can still decompose into S and H2 at temperatures between 350–400°C. The elemental sulfur that is released causes more severe corrosion than H2S. Fe+S→FeS: The corrosion caused by sulfur at high temperatures begins at a high rate, and after a certain period of time, the corrosion rate stabilizes.
1. In the first stage, organic sulfides are converted into hydrogen sulfide and elemental sulfur, which act directly on the surface of steel to cause corrosion； 2. The corrosion caused by high-temperature sulfur is rapid at first, but after a certain period of time, the corrosion rate stabilizes. It primarily forms a protective film of iron sulfide.
Iron reacts with hydrogen sulfide to produce ferrous sulfide and hydrogen