16- In steels, there are (___) types of proeutectoid phases. (Fill in the blank

Question

16- In steels, there are (___) types of proeutectoid phases. (Fill in the blank with a number). These phases have a very similar morphology. True___ or False___?

17- Aging could make Al-Cu alloy stronger. True___ or False___?

18- To protect steel gas pipeline from corrosion in soil, Mg sacrificing stations are used. The dryer the soil, the closer the station should be. True___ or False___?

19- the corrosion property of stainless steel may be improved by annealing at 800 C. True___ or False___?

20- Zinc is generally lost from brass in corrosion medium. This type of corrosion is called__________________________?

16- In steels, there are (_) types of proeutectoid phases. (Fill in the blank with number). These phases have a very similar morphology. True__or False_ 17- Aging could make Al-Cu alloy stronger. True_ or False_ _? 18- To protect steel gas pipeline from corrosion in soil, Mg sacrificing stations are used. The dryer the soil, the closer the station should be. True or False__? 19- the corrosion property of stainless steel may be improved by annealing at 800 C. True or False 20- Zinc is generally lost from brass in corrosion medium. This type of corrosion is called _?

Explanation / Answer

16. 2(Two) that is Proeutectoid Ferrite, Proeutectoid Cementite

False they are having different morphology.

17. True aging will make them stronger because of work hardening upto certain limit after which it fails.

18. False dryer the soil farther will be station because of less moisture in soil so lessser will be corrosion.

19. False at high temperatures corrosion always increases.

20. Intergranular Corrosion because of depletion of grain boundaries.

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