What are the traditional methods of rust prevention for bolts and nuts, and how effective are they?

Bolts and nuts as fasteners have a very important role in the development of production. Is widely used in railroads, bridges, electric power, road, machinery and equipment, industrial and mining and other various industries. For a long time, a variety of facilities on the bolts and nuts due to long-term exposure to the outside world, wind and rain, quickly oxidized and lead to rust, to a variety of facilities repair, maintenance and bring a lot of inconvenience, especially in the corrosion, it is difficult to dismantle, time-consuming and costly, resulting in great losses. The traditional antirust method for bolts and nuts is to coat the surface of bolts and nuts with antirust oil or antirust paint, whose function is to isolate them from the outside air and water, and to achieve good antirust effect in a short time. However, with the external climate, temperature changes and influence, paint and anti-rust oil will fall off, loss. The exposed bolts and nuts will soon be oxidized and rusted, if not handled in a timely manner, the speed of corrosion will accelerate, and finally lead to the entire screw was rusted, had to be replaced.