24. Chemical action during corrosion converts metal into metailic component as a

Question

24. Chemical action during corrosion converts metal into metailic component as a. hydroxide b. oxide 25. Which of the following corrosions are caused due to velocity of c. sulphate d. all of the above a. Bimetal corrosion re caused due fluid flow in pipes? b. Cavi corrosion 26. Pourbaix diagram is a graphical plot of (a) Emf Verses pH (b)Emf Verses Logi (c) Emf Verses time 27. Passivity in stainless steel is due to the formation of tation corrosion c. galvanic corrosion d. intergranular (d) Current Verses Potential (a) sulphide film (b) carbide film (c) Oxide film (d) chloride film 28. Iron pipe carrying $ater is more anodic to copper. This is due to (b) Galvanic cell (c) electrolytic cell (a) concentration cell 29. This occurs when two surfaces fit tightly together but can move relative to one another, resulting in constant rubbing and abrasive wear (d) Fretting Corrosion (c) Pitting Corrosion (b) Stress Corrosion 30. Also known as dry corrosion, this occurs when a metal such as aluminum is exposed to a gas containing oxygen, a chemical reaction takes place on the surface between the metal and the gas. (a) Types of Corrosion (d)Oxidation (c) Proton (b) Electron (a) lon

Explanation / Answer

Ans 24 : d) all of the above

Corrosion is the process in which the exposed surface of refined metal is converted into its corresponsing oxide , sulfide or hydroxide.

Such as the corrosion of Iron metal , which is also called as rusting , converts the metal into its oxide form which is much more stable than its pure elemental state.

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