The Main Influencing Elements Of Corrosion In Pressure Vessels

Pressure Vessels are enclosed equipment loaded with liquids and gases and subject to high pressures, or with fluids inside that can form pressures, as well as equipment subject to external pressure, etc. Corrosion, cracking, breakage, erosion and physical damage are the most obvious forms of failure of pressure vessels. Pressure vessels and accessories are often subject to major catastrophic accidents due to corrosion, deterioration, alteration and cracking of materials, most of which are caused by corrosion. A complete structure of the pressure vessel, often due to the use of the process of neglecting the corrosion problem and caused by the application period decline or damage failure, causing safety accidents, in the specific operation must be profoundly aware of the use of scientific strategies to prevent.

The main influencing factors of corrosion in pressure vessels

1. External environmental reasons

The internal and external environment of the pressure vessel will directly affect its anti-corrosion performance. Pressure vessels carry more types of reagents, containing many material costs, will inevitably be mixed with a small amount of corrosive materials, such as acidic materials, alkaline materials, etc., these components are very likely to lead to pressure vessels corrosion phenomenon. External environmental causes of corrosion on the pressure vessel is a variety of forms of impact, one, the pressure vessel in the application of corrosion, the rise in internal pressure will play an obvious catalytic effect, accelerate the corrosion reaction, and then worsen the corrosion problem. Second, the temperature in the pressure vessel will accelerate the reaction rate, the temperature rises, ion flow rapidly, the internal temperature rises every 10 ℃, the chemical reaction rate will accelerate 2 times to 3 times. Third, the internal acid and alkali environment will catalyse the rate of corrosion reaction, acid and alkali environment is not the same, the internal ion content will be different.

2. Material characteristics factors

Pressure vessel material characteristics greatly affect and determine the level of corrosion resistance of the pressure vessel. First, the corrosion rate will be subject to surface metal substance crystal structure density and oxidation interference, the greater the crystal structure density, the rougher the surface, the greater the crystal pore slit, the service material is more likely to deep, the more likely to appear corrosion reaction. Second, in the use of pressure vessels, if the content added to the pressure is too large and internal calcination and other phenomena, when the internal pressure is very strong, are likely to lead to changes in the pressure vessel, and then cause corrosion reactions, if the internal H2S at this time, the container is very likely to corrosive damage. Thirdly, if the pressure vessel material composition, will accelerate the electrochemical corrosion reaction rate. In the composition of the mixed pressure vessel, very easy to meet the original battery reaction to read, if the internal appearance of inert materials, then it will accelerate the rate of metal corrosion.