““Test Your Knowledge” “Guess What” – Summary and compilation (continuously updated)

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This post was last edited by “Parting Comes, Parting Goes” on December 7, 2009, at 10:33. In response to the forum’s call, and to facilitate centralized management as well as learning for new members, while also making it easier for existing members to find relevant information, we have organized and compiled a directory of posts within this section. We are now compiling the activity posts in the forum section, namely “Test Your Knowledge” and “Guess What”, and all forum members are welcome to participate actively! 1. Format: “Title” + “Link” + “Question”. Example: “Test your knowledge: Crevice corrosion” + “http://bbs.hcbbs.com/thread-569140-1-2.html” + “What is crevice corrosion?” What are the features? ” 2. One post per 5 links ； 3. Order posts by posting time; avoid confusion ； 4. Check the time on the upstairs display; do not repeat it ； 5. This consolidation is organized as a forum activity, with +3 charm added to each post as a form of recognition! -------------------------------------------------------------------------- Compile everyone’s work results for easy reference, so as to avoid duplication in the new building (duplicate cases have already been found, and there are quite a few of them~) -------------------------------------------------------------------------- 1. “Test your knowledge: Reasons for cable sheath corrosion” + “http://bbs.hcbbs.com/viewthread.php?tid=473735” + “Reasons for cable sheath corrosion” 2. “Test your knowledge: What are the colors of rust, zinc rust, and copper rust respectively?” ”+“http://bbs.hcbbs.com/viewthread.php?tid=555722”+“Please answer what are the colors of the metal corrosion products mentioned below? ” 3. “Test your knowledge: Resistant to acid and alkali corrosion, but cannot be exposed to the atmosphere? ”+“http://bbs.hcbbs.com/viewthread.php?tid=558933”+“Why can plastics such as polyethylene and polyvinyl chloride resist acid and alkali corrosion, but yet deteriorate and get damaged rapidly when exposed to the outdoor atmosphere?” ” 4. “Test your knowledge: Material selection for repairing leaks in carbon steel containers” + “http://bbs.hcbbs.com/viewthread.php?tid=559535” + “To repair a leaking carbon steel container, which metal material do you think is the best choice for welding? (1) Stainless steel (2) Copper (3) Carbon steel. Why?” ? Please explain the reason. ” 5. “Test your knowledge: Reasons for corrosion damage in overpasses in the north” + “http://bbs.hcbbs.com/viewthread.php?tid=559755” + “What are the main reasons for corrosion damage to the rebar in certain overpasses in cities in northern China (such as Beijing and Tianjin)?” And explain in detail! ” 6. “Test your knowledge: Direct and indirect losses due to bridge corrosion damage” + “http://bbs.hcbbs.com/viewthread.php?tid=560778” + “What are the direct and indirect losses associated with the corrosion damage of an important bridge?” What is the multiple by which its indirect losses can reach the direct losses?” 7. “Test your knowledge: What is polarization? ”+“http://bbs.hcbbs.com/viewthread.php?tid=561911”+“What is polarization?” What is the effect of polarization on the corrosion process of metals? ” 8. “Test your knowledge: The impact of flow on corrosion” + “http://bbs.hcbbs.com/viewthread.php?tid=562438” + “What is the effect of fluid flow over a material’s surface on the corrosion of that material?” ” 9. “Test your knowledge: Wet corrosion and dry corrosion” + “http://bbs.hcbbs.com/viewthread.php?tid=562137” + “What is wet corrosion?” What is dry corrosion? What are the conditions for wet corrosion and dry corrosion to occur, respectively? ” 10. “Test your knowledge: Hydrogen-induced fracture” + “http://bbs.hcbbs.com/viewthread.php?tid=563151” + “What is the principle behind hydrogen-induced fracture?” What are the pathways for hydrogen formation? ” 11. “Guess: What percentage of our country’s annual gross national product (GNP) is lost due to corrosion each year?” ”+“http://bbs.hcbbs.com/viewthread. ... =%B2%C2%B2%C2%BF%B4”+“What is the percentage of the country’s annual economic losses due to corrosion in relation to its gross national product (GNP)? (A) Around 0.5% (B) Around 5% (C) Around 15%” 12. “Guess: What is water used for heating?” ”+“http://bbs.hcbbs.com/viewthread. ... =%B2%C2%B2%C2%BF%B4”+“What is water used for heating?” Is it regular tap water? Can it be used for washing the face or cooking? Why?” 13. “Guess: What is the main difference in the chemical composition of carbon steel and cast iron?” ”+“http://bbs.hcbbs.com/viewthread. ... =%B2%C2%B2%C2%BF%B4”+“What do you think are the main differences in the chemical composition of carbon steel and cast iron? 1. Different carbon content ； 2. Different sulfur contents ； 3. The oxygen content is different. ” 14. “Guess: What’s up with the Sea Sand House?” ”+“http://bbs.hcbbs.com/viewthread. ... =%B2%C2%B2%C2%BF%B4”+“Which of the following situations does the term ‘sea sand house’ refer to?” 1. Cave dwellings dug out on the beach by the sea ； 2. Some concrete houses built using sea sand instead of river sand ； 3. Reinforced concrete buildings, bridges, and other structures constructed using sea sand with high salt content and that does not meet quality standards in place of river sand ； ” 15. “Test your knowledge: Anti-aqua regia” + “http://bbs.hcbbs.com/viewthread.php?tid=563712” + “Everyone knows about aqua regia, but what is anti-aqua regia? What is it made of, and what are the proportions?” It also has a beautiful name; how did it get that name? ” 16. “Test your knowledge: Molten salt corrosion” + “http://bbs.hcbbs.com/viewthread.php?tid=563725” + “What is molten salt corrosion?” What are the characteristics?” 17, “Test your knowledge: Selection of pipeline materials for transporting hydrochloric acid, dry chlorine gas, and HCL gas” + “http://bbs.hcbbs.com/viewthread.php?tid=565107” + “Is titanium suitable for pipelines used in transporting hydrochloric acid, dry chlorine gas, and HCL gas?” What materials of pipes are most suitable for transporting these three types of media respectively? ” 18. “Test your knowledge: A thermodynamic explanation of metal corrosion” + “http://bbs.hcbbs.com/viewthread.php?tid=565707” + “Everyone knows that the corrosion of metals in air is a process in which the metal reacts with substances present in the air, primarily oxygen.” So, please analyze it from a thermodynamic perspective: why do some metals (such as iron) corrode in air, while others (such as gold) do not? ” 19. “Test your knowledge: Corrosion caused by hydrogen sulfide and sulfur-containing gases” + “http://bbs.hcbbs.com/viewthread.php?tid=566219” + “What are the reasons for metal corrosion caused by hydrogen sulfide and sulfur-containing gases?” ” 20. “Test your knowledge: What is polarization?” ”+“http://bbs.hcbbs.com/viewthread. ... =%BF%BC%BF%BC%C4%E3”+“What is polarization?” What is the effect of polarization on the corrosion process of metals? ” 21. “Test your knowledge: Corrosion caused by hydrogen sulfide and sulfur-containing gases” + “http://bbs.hcbbs.com/viewthread. ... =%BF%BC%BF%BC%C4%E3” + “What are the reasons for metal corrosion caused by hydrogen sulfide and sulfur-containing gases?” ” 23. “Test your knowledge: A thermodynamic explanation of metal corrosion” + “http://bbs.hcbbs.com/viewthread. ... =%BF%BC%BF%BC%C4%E3” + “Please analyze from a thermodynamic perspective: Why do some metals (such as iron) corrode in air, while others (such as gold) do not?” ” 24. “Test your knowledge: Molten salt corrosion” + “http://bbs.hcbbs.com/viewthread. ... =%BF%BC%BF%BC%C4%E3” + “What is molten salt corrosion?” What are the features? ” 25. “Test your knowledge: Methods for preventing intergranular corrosion” + “http://bbs.hcbbs.com/viewthread.php?tid=567045” + “Intergranular corrosion in austenitic stainless steels is quite common in industry and poses the greatest risks.” What are the methods to prevent intergranular corrosion? ” 26. “Test your knowledge: The area factor in galvanic corrosion” + “http://bbs.hcbbs.com/viewthread.php?tid=567698” + “As we all know, when metal components made of different materials come into contact with each other, galvanic corrosion occurs due to differences in potential. Please analyze whether, in the case of galvanic corrosion, corrosion is more severe when the anode has a larger area and the cathode has a smaller area, or when the cathode has a larger area and the anode has a smaller area.” ” 27. “Test your knowledge: Stress corrosion cracking” + “http://bbs.hcbbs.com/viewthread.php?tid=568709” + “What is stress corrosion cracking?” What are its characteristics? ” 28. “Test your knowledge: Crevice corrosion” + “http://bbs.hcbbs.com/viewthread.php?tid=569140” + “What is crevice corrosion?” What are the features? ” 30. “Guess: What is water used for heating?” ”+“http://bbs.hcbbs.com/viewthread.php?tid=563415”+“What is water used for heating?” Is it regular tap water? Can it be used for washing the face or cooking? Why?” 31. “Guess: What is the main difference in the chemical composition of carbon steel and cast iron?” ”+“http://bbs.hcbbs.com/viewthread.php?tid=565841”+“What do you think are the main differences in the chemical composition of carbon steel and cast iron?” 32、「Guess: What is the story behind Sea Sand House?」 ”+“http://bbs.hcbbs.com/viewthread.php?tid=569758”+“Which of the following situations does the term ‘sea sand house’ refer to?” ” 33. “Test your knowledge: Direct and indirect losses caused by bridge corrosion damage” + “http://bbs.hcbbs.com/viewthread. ... =%BF%BC%BF%BC%C4%E3” + “What are typically the direct and indirect losses associated with the corrosion damage of an important bridge?” What is the multiple by which its indirect losses can reach the direct losses? (1) 1.5 times (2) 2.5 times (3) >4 times” 34. “Test your knowledge: Hydrogen-induced fracture” + “http://bbs.hcbbs.com/viewthread. ... =%BF%BC%BF%BC%C4%E3” + “What is the principle behind hydrogen-induced fracture?” What are the pathways for hydrogen formation? ” 35. “Test your knowledge: Methods for preventing intergranular corrosion” + “http://bbs.hcbbs.com/viewthread. ... =%BF%BC%BF%BC%C4%E3” + “What are the methods for preventing intergranular corrosion?” ” 36. “Test your knowledge: Wet corrosion and dry corrosion” + “http://bbs.hcbbs.com/viewthread. ... =%BF%BC%BF%BC%C4%E3” + “What is wet corrosion?” What is dry corrosion? What are the conditions for wet corrosion and dry corrosion to occur, respectively? ” 37. “Test your knowledge: The area factor in galvanic corrosion” + “http://bbs.hcbbs.com/viewthread. ... =%BF%BC%BF%BC%C4%E3” + “When galvanic corrosion occurs, is corrosion more severe when the anode area is larger and the cathode area is smaller, or when the cathode area is larger and the anode area is smaller?” ” 38. “Test your knowledge: The impact of flow on corrosion” + “http://bbs.hcbbs.com/viewthread. ... =%BF%BC%BF%BC%C4%E3” + “What is the effect of fluid flow over a material’s surface on the corrosion of that material?” ” 39. “Test your knowledge: Classification of stainless steel” + “http://bbs.hcbbs.com/viewthread. ... =%BF%BC%BF%BC%C4%E3” + “What is austenitic stainless steel?” What is martensitic stainless steel? What is carbide stainless steel? What are their respective characteristics? ” 40. “Guess: Various factors contributing to soil corrosion” + “http://bbs.hcbbs.com/viewthread. ... =%B2%C2%B2%C2%BF%B4” + “Among various factors such as stray currents in the soil, microorganisms, debris, moisture, and salts, which ones do not accelerate the corrosion and damage of subway facilities and underground metal pipelines?” 41. “Test your knowledge: Hastelloy” + “http://bbs.hcbbs.com/viewthread. ... =%BF%BC%BF%BC%C4%E3” + “What is Hastelloy?” What is its composition? What is its main use? ” 42. “Test your knowledge: Monel alloy” + “http://bbs.hcbbs.com/viewthread.php?tid=574550” + “What is Monel alloy?” What is its composition? What is its main use? ” 43. “Test your knowledge: Super stainless steel” + “http://bbs.hcbbs.com/thread-574881-1-1.html” + “What is super stainless steel?” ” 44. “Test your knowledge: Duplex stainless steel” + “http://bbs.hcbbs.com/viewthread.php?tid=576878” + “What is duplex stainless steel?” What are its features and uses? ” 45. “Test your knowledge: Sandblasting and shot blasting for rust removal” + “http://bbs.hcbbs.com/viewthread.php?tid=581929&;pid=3290105” + “What is the difference between sandblasting and shot blasting for rust removal?” What are the respective process factors and quality control points? ” 46. “Test your knowledge: Advantages of ship paint” + “http://bbs.hcbbs.com/thread-583230-1-1.html” + “What are the advantages of ship paint?” ” 47. “Test your knowledge: Methods of paint application” + “http://bbs.hcbbs.com/thread-584281-1-1.html” + “How many methods are there for paint application? In what situations are they used?” ” -------------------------------------------------------------------------- Compile everyone’s work results for easy reference, so as to avoid duplicates in the new building (duplicate entries have already been found, and there are quite a few of them~) --------------------------------------------------------------------------