【Daily Question】2.9 Hydrogen embrittlement sensitive materials (3 wealth points for a reply + additional 3–8 wealth points for a correct answer)
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This post was last edited by lzy4225925 on 2016-2-10 at 19:00. Topic: Judgment: Cathodic protection cannot be used for materials sensitive to hydrogen embrittlement. ( ) Regarding the requirements for answering the questions and any hints: Please answer carefully. Hint: If you’re unsure, use Baidu. Note: We will close this thread after 24 hours, and at that time we will announce the best response (the most helpful one), along with the 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) ★Haichuan’s “Gratitude Season” – a large-scale member sharing event★ (To enter the lucky prize draw, click “I want to register”). 【Mechanical Section】A comprehensive guide to preventing equipment from freezing over during winter. 【Mechanical Section】Call for submissions of valuable knowledge. 【Seeking manufacturer sponsors】(Ongoing activity). Rewards are available for recommending valuable content; the competition for “Most Active Users” and “Weekly Stars” in the Mechanical Section has begun. Wealth, metals, corrosion, sections, machinery
Cathodic protection cannot be applied to materials sensitive to hydrogen embrittlement. (Yes)
Cathodic protection cannot be applied to materials sensitive to hydrogen embrittlement. (Yes)
Cathodic protection cannot be applied to materials sensitive to hydrogen embrittlement. (Correct)
Correct. The reasons are as follows: 1) First, the direction is incorrect. Due to the decrease in solubility, during the cooling process after forging, the positive hydrogen ions in steel gain electrons and turn into hydrogen gas, which then accumulates within the material, leading to hydrogen embrittlement. From an electrochemical perspective, the release of hydrogen is a reduction process. Cathodic protection addresses the issues related to oxidation processes, and it merely accelerates the release of hydrogen without actually solving the problem. (2) Cathodic protection is designed to deal with problems on the surface of materials that are immersed in an electrolyte, whereas hydrogen embrittlement occurs as defects within the material itself. Hydrogen gas near the surface can easily diffuse out, so there is generally no issue of hydrogen embrittlement at the surface of the material; therefore, even if this method were effective, it would likely not be sufficient to address the problem. (3) In summary, cathodic protection is ineffective against hydrogen embrittlement, and it does not seem like a good approach for solving this issue.
Cathodic protection cannot be applied to materials sensitive to hydrogen embrittlement. (Yes)
Correct! Because cathodic protection is ineffective for materials sensitive to hydrogen embrittlement.