Question

lohe mai jang lgne se rokne ke liye teen upaye btaiye

Answer 1

f metal is outside, its rusting time will be increased. Especially in humid/wet temperatures. Stainless steel and weathering steel seem to be the most common type of way to prevent rust. Alloys are less prone to rust and key ones include-

Stainless steel is made up of 11% chromium, this allows transformation so it can be used as a protective layer for chromium oxide,  which basically shields the metal from rusting. If nickel is added to stainless steel as a component it can increase the protection of rusting.
Weathering Steel is made up of 21% of elements such as chromium, copper, nickel and phosphorous. The alloys which form from this decrease the corrosion rate – Weathering steel can be known as COR TEN and seems to be cheaper than stainless steel.

Answer 2

for preventing corrosion in the iron ,correct preventive methods are as follows, :-
1. galvanisation of iron.
2. electroplating of iron metal.
3. by painting iron metal.
this majors steps are very useful to avoid rusting of iron metal.

hope it helps :)