Explain the process of corrosion and rusting

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Solution

Dear Student
Corrosion is defined as the destruction of metals due to chemical or electrochemical processes.
Rusting is defined as corrosion of iron.
$P r o c e s s o f c o r r o s i o n (F o r c o p p e r) / E q u a t i o n o f c o r r o s i o n (F o r C o p p e r) : 2 C u + O_{2} + C O_{2} + H_{2} O \to C u C O_{3} . C u {(O H)}_{2} R u s t i n g : I r o n l o s e s e l e c t r o n s F e \to F e^{2 +} + 2 e^{-} E l e c t r o n s p r o d u c e d b y t h i s r e a c t i o n c o m b i n w w i t h h y d r o g e n i o n s i n w a t e r 4 e^{-} + 4 H^{+} + O_{2} \to 2 H_{2} O H^{+} a r e r e a c t e d s o l e f t a r e O H^{-} i o n s . F e^{2 +} + 2 O H^{-} \to F e {(O H)}_{2} a l s o 4 F e^{2 +} + 4 H^{+} + O_{2} \to 4 F e^{3 +} + 2 H_{2} O F e^{3 +} + 3 O H^{-} \to F e {(O H)}_{3} T h i s c o m p o u n d d e h y d r a t e s t o g i v e F e_{2} O_{3} F e_{2} O_{3} + x H_{2} O \to F e_{2} O_{3} . x H_{2} O T h i s i s t h e c h e m i c a l f o r m u l a f o r r u s t$
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What is difference between corrosion and rusting ?

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