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To prevent rusting in electric iron, the plates of the bottom surface and edges are made of ________.
heavy iron
asbestos
heavy chromium
mica
heavy chromium
The sole plate of an electric iron is coated with heavy chromium to provide a smooth, corrosion-resistant, and durable surface. Chromium plating prevents oxidation and rusting while allowing the iron to glide easily over fabrics.
IS 1068:1985 (Specification for Electroplated Coatings of Nickel and Chromium on Iron and Steel)
The sole plate of an electric iron is coated with heavy chromium to provide a smooth, corrosion-resistant, and durable surface. Chromium plating prevents oxidation and rusting while allowing the iron to glide easily over fabrics.
Cr+O2тАЛтЖТCr2тАЛO3тАЛ тАФ representing the formation of the thin, protective chromium oxide passive layer.
Chromium plating is an electroplating process where a thin layer of chromium is deposited onto the base metal (typically steel or iron). The chromium layer forms a thin, stable passivating oxide film that protects the underlying metal from moisture and oxygen, effectively stopping the formation of iron oxide (rust).
Chromium provides high surface hardness and excellent wear resistance.
The low coefficient of friction of chromium plating ensures smooth ironing.
The coating is non-toxic and withstands high thermal stress without peeling.
Exceptional corrosion resistance
High surface finish (smoothness)
Increased wear resistance
Process requires specialized electroplating facilities
Brittle nature if coating is too thick
Domestic electric iron sole plates
Industrial heat-sealing machines
Kitchen appliance surfaces
Asbestos was historically used for thermal insulation but is now avoided due to health hazards (carcinogenic).
Mica is an excellent electrical insulator and heat conductor used inside the heating element assembly, but it is not used for the outer sole plate surface.
Heavy iron itself is highly prone to oxidation in the presence of heat and humidity, which is why it requires a protective finish.
C is correct тАФ heavy chromium plating is the standard industrial method for preventing rust and providing a durable finish on electric iron sole plates.
Always distinguish between insulating materials (like mica) and protective surface coatings (like chromium) when analyzing appliance design.
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