GATE MT 2020 Q15. Which one of the following statements regarding selective leaching of a binary alloy is TRUE?
GATE MT 2020 Q15. Which one of the following statements regarding selective leaching of a binary alloy is TRUE?
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Correct answer is option A. @Rohit.km described it best. Thank you. Some peripheral lines related to this topic: Selective leaching, also called dealloying, demetalification, parting and selective corrosion, is a corrosion type in some solid solution alloys, when in suitable conditions a component oRead more
Correct answer is option A. Rohit jha.km described it best. Thank you.
Some peripheral lines related to this topic:
Respected sir/madam, I had this doubt regarding electronegativity. Generally its seen more electropositive metals corrode while more electronegative act as cathode. I checked for electronegativity values for Cu and Zn, they were 1.9 and 1.65 respectively. Then why does the option say more electronegRead more
Respected sir/madam,
I had this doubt regarding electronegativity. Generally its seen more electropositive metals corrode while more electronegative act as cathode. I checked for electronegativity values for Cu and Zn, they were 1.9 and 1.65 respectively. Then why does the option say more electronegative is leached?
Thank you
See lessThe higher electronegative elements is more active and acts as anode
The higher electronegative elements is more active and acts as anode
See lessMore electronegative elements leached
More electronegative elements leached
See lessSelective leaching ( or dealloying ) of an alloy is the preferentially attacking of one of its components in presence of some electrolyt occurring as a result of oxidation-reduction reactions. In Binary alloys( or other multiphase alloys) it is usually common when elements have high electode potentRead more
Selective leaching ( or dealloying ) of an alloy is the preferentially attacking of one of its components in presence of some electrolyt occurring as a result of oxidation-reduction reactions.
In Binary alloys( or other multiphase alloys) it is usually common when elements have high electode potential difference. In that case the lower electrode potential element act as anode or called ACTIVE element and the higher act as cathode or called NOBLE element.
Example Dezincification of Brass(Cu-Zn) alloy
Here the Zn has lower electrode potential act as Active metal and Cu having higher act as Noble metal. In one method in suitable condition only Zn leaves as Zn2+ and thus corrodes.
Another method it says that Cu and Zn leaves together but Cu being noble metal returns back to alloy thus selective corrosion occurs.
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