The corrosion damage of steel structure

Because of the common steel corrosion resistance is poor, so the corrosion of steel structure has been an important issue of concern in engineering. According to statistics, around the world each year 30% of the annual output of -40% steel failure due to corrosion, in addition to waste recycling, the net loss of about 10%. Corrosion results of steel structure not only economic and resource loss, corrosion to steel structure net section impairment, reduces the structure bearing capacity and reliability, at the same time the formation of corrosion "rust" make steel structure increases the possibility of generating brittle failure, especially anti drop performance of cold brittle. According to statistics, accidents and damages to a considerable proportion of structures and buildings are caused due to steel corrosion, so the corrosion protection is of great significance to save steel and preventing engineering accidents.
Steel structure should be inspected periodically during use, such as the discovery of the basic metal corrosion, to the use of measuring tools or the thickness measuring instrument to identify the component section weakened degree, whether to adopt the replacement or reinforcement measures determined by calculation.
In the past such as oil pan coating to protect the steel structure, and later also to plating casting, aluminum spray method to anti corrosion. In recent years people to seek a positive increase steel corrosion resistance performance, usually in a low carbon steel smelting adding phosphorus, copper, alloy elements such as anchor and sickle, rust layer causes the atmospheric chemical reactions and steel outside the surface forming a dense atmosphere, isolation cover layer effects, and not easy to aging and loss. This is the current development trend of foreign metal corrosion.