① The influence of water. Among the substances that corrode steel in the atmospheric environment, water is the main factor (generally speaking, the higher the humidity, the stronger the corrosivity). The corrosion principle is as follows: A. water is an electrolyte and can dissolve a large number of ions, thus causing metal corrosion. b. Water can be dissociated into H +, oh -. Different pH values have obvious effects on the dissolution corrosion of metals and oxides.

② SO2. In areas polluted by industrial waste gas, SO2 has a serious impact on steel corrosion. The exhaust gas fueled by oil, natural gas and coal contains a large amount of SO2, and the corrosion rate of steel plate increases with the increase of SO2 content in the atmosphere.

③ Ocean and atmospheric impacts. The atmosphere near the sea contains a certain amount of salt, the main component of which is NaCl, Cl - which is highly corrosive, so it can intensify corrosion. The farther away from the sea, the less salt in the atmosphere and the smaller the corrosion amount.

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④ Other impacts. In the atmospheric environment of oil production, there may be a large number of harmful substances such as Cl2, NH3, H2S solid dust particles, etc., and their corrosion to the steel of the gas storage tank also increases with the increase of the content. The synergistic effect of several substances will lead to the aggravation of steel corrosion.