External and human factors causing corrosion in petrochemical equipment
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1. External factors causing equipment corrosion ⑴ Humid air. On metal surfaces, liquid water accumulates in the recessed areas or at the bottom of the surface, where oxidation occurs. At the same time, oxides such as rust absorb moisture more easily, leading to a vicious cycle of oxidative corrosion. ⑵Corrosive gases in the air. Air quality is deteriorating increasingly, with the levels of acidic gases such as sulfur dioxide rising year by year. The water that condenses on the surface of equipment due to cold weather dissolves these acidic gases in the air, causing chemical corrosion to the equipment from the outside. 2. Human factors contributing to equipment corrosion: The welding areas and the bottom of the equipment suffer more severe rusting than other parts. The need to remove rust and repaint only those areas results in uneven coloring of the tank walls, and the high costs associated with rust removal and repainting across the entire equipment mean that rust prevention measures are not carried out in a timely manner. Furthermore, there are no strict requirements for rust removal and anti-corrosion procedures, which results in incomplete or even substandard rust removal and anti-corrosion work each time.
The corrosion of petrochemical equipment is primarily influenced by both the external environment and human operations. **External factors: ** - When the air is humid, water tends to accumulate in the recesses on the surface of the equipment, leading to metal oxidation and rusting. Rust also absorbs water, creating a vicious cycle. - Acidic gases such as sulfur dioxide present in the air, when they come into contact with condensation water on the surface of equipment, form acidic liquids that directly corrode the surface of the equipment. **Human factors: ** - The welded areas and bottom of the equipment are prone to rusting, but only partial repairs are often carried out, resulting in uneven colors; the overall cost of rust removal is high, which often leads to delays in taking action. - The lack of a standardized rust removal and corrosion prevention process results in incomplete work or even substandard outcomes, further exacerbating the corrosion problem. In simple terms, humid air and polluted gases are the external \"culprits\", while inadequate maintenance and improper operation are the human-related \"weaknesses\". .
Equipment is often not descaled and protected against corrosion in a timely manner. Furthermore, there are no strict requirements for rust removal and anti-corrosion procedures, which results in incomplete or even substandard rust removal and anti-corrosion work each time.