【Daily Question】2015.07.13 Pitting (Top 100 replies +2 points, plus 3-8 additional points for correct answers)

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This post was last edited by zzhaichuan on 2015-7-14 09:17. The Machinery Section has introduced the \"One Question per Day\" feature, which aims to foster an active atmosphere for technical exchanges and guide the direction of such discussions, while also providing users with financial rewards to help them experience various cool features. The main cause of pitting corrosion on the inner and outer walls of pressure vessels is basically due to (). A. Chemical corrosion B. Electrochemical corrosion C. Hydrogen corrosion Answer: B. Electrochemical corrosion Please 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 answer and its explanation. Charisma Reward: If you post a topic in this section within two days to provide a detailed explanation or discussion of the knowledge points related to this question, please reply/comments in this post to let us know, and we will have a moderator award you charisma points. It is not allowed to simply copy and paste; original content is preferred, with at least some organization by the user along with personal insights. After registration, we will rank based on the content of the posts: the last-place contestant will receive +1 charm, the second-to-last +2 charm, and so on, with the highest score earning +5 charm. http://bbs.hcbbs.com/thread-1381938-1-1.html Earning wealth by inviting friends http://bbs.hcbbs.com/thread-1389240-1-1.html [Mechanical Section] Collection of essential knowledge 【Seeking manufacturer sponsorship】 (long-term campaign)