Question

why aluminium and zinc called self protectedmetals ?​

Answer 1

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Although it is chemically very reactive, aluminum resists corrosion by the formation of a self-protecting oxide coatingThat is why aluminium is called as the self protecting metal. Due to high reactivity of aluminium a thin layer of aluminium oxide is formed on it. ... Hence, aluminium is called a self protecting metal.

Answer 2

Answer:

Aʟᴛʜᴏᴜɢʜ ɪᴛ ɪs ᴄʜᴇᴍɪᴄᴀʟʟʏ ᴠᴇʀʏ ʀᴇᴀᴄᴛɪᴠᴇ, ᴀʟᴜᴍɪɴᴜᴍ ʀᴇsɪsᴛs ᴄᴏʀʀᴏsɪᴏɴ ʙʏ ᴛʜᴇ ғᴏʀᴍᴀᴛɪᴏɴ ᴏғ ᴀ sᴇʟғ-ᴘʀᴏᴛᴇᴄᴛɪɴɢ ᴏxɪᴅᴇ ᴄᴏᴀᴛɪɴɢTʜᴀᴛ ɪs ᴡʜʏ ᴀʟᴜᴍɪɴɪᴜᴍ ɪs ᴄᴀʟʟᴇᴅ ᴀs ᴛʜᴇ sᴇʟғ ᴘʀᴏᴛᴇᴄᴛɪɴɢ ᴍᴇᴛᴀʟ. Dᴜᴇ ᴛᴏ ʜɪɢʜ ʀᴇᴀᴄᴛɪᴠɪᴛʏ ᴏғ ᴀʟᴜᴍɪɴɪᴜᴍ ᴀ ᴛʜɪɴ ʟᴀʏᴇʀ ᴏғ ᴀʟᴜᴍɪɴɪᴜᴍ ᴏxɪᴅᴇ ɪs ғᴏʀᴍᴇᴅ ᴏɴ ɪᴛ. Hᴇɴᴄᴇ, ᴀʟᴜᴍɪɴɪᴜᴍ ɪs ᴄᴀʟʟᴇᴅ ᴀ sᴇʟғ ᴘʀᴏᴛᴇᴄᴛɪɴɢ ᴍᴇᴛᴀʟ.

$\huge\mathfrak\red{∆Stalwart King}$