【Daily Question】1.23 Electrochemical protection of hydrogen embrittlement-sensitive materials (3 wealth points for a reply; +3 to +8 wealth points for a correct answer)
Thread Content
Question: True or False: Materials sensitive to hydrogen embrittlement cannot be protected by cathodic protection ( ). Regarding the requirements for answering the questions and the hints: Please answer carefully. Hint: You can guess if you’re unsure. Note that we will close this thread after 24 hours, during which time we will announce the best response (the most helpful one), as well as 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) 【Mechanical Zone】Comprehensive guide to preventing equipment freezing over during winter 【Mechanical Zone】Call for collection of essential knowledge 【Seeking manufacturer sponsors】(Ongoing campaign) Rewards for recommending valuable content; the “Most Active Users and Weekly Stars” competition in the Mechanical Zone has begun. Wealth, metals, corrosion, zones, machinery
Materials sensitive to hydrogen embrittlement cannot be protected by cathodic protection (True).
Materials sensitive to hydrogen embrittlement cannot be protected by cathodic protection (True).
Materials sensitive to hydrogen embrittlement cannot be protected by cathodic protection (True).
Materials sensitive to hydrogen embrittlement cannot be protected by cathodic protection (True)
Correct – (1) First of all, 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; it merely accelerates the release of hydrogen and does not solve the underlying problem. (2) Cathodic protection deals 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 of the material can easily diffuse out, so there is generally no issue of hydrogen embrittlement at the surface. Therefore, even if this method were effective, it would likely be ineffective in dealing with this problem.
That’s right; cathodic protection cannot be used