For stainless steel heat exchangers, it is essential to set the temperature properly; otherwise, corrosion will be severe

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For stainless steel heat exchangers, it is essential to maintain a specific temperature; otherwise, severe corrosion will occur. Example: The acetic acid evaporator in a certain factory was made of 0Cr17Ni14Mo3 stainless steel. Operating pressure: 0.08 MPa, operating temperature: 135–140°C. Acetic acid vapor enters the mixer and mixes with acetylene. Due to the high temperature of acetic acid, as well as factors such as pressure and erosion, 0Cr17Ni14Mo3 stainless steel can only last for a few months. Later, the process was improved by feeding acetylene directly into the evaporator, which reduced the evaporation temperature of acetic acid to 80–85°C and thereby diminished corrosion in the evaporator. Analysis: This example shows that the effect of temperature on metal corrosion is multifaceted and complex. But it is certain that, in most cases, an increase in temperature will increase the rate of metal corrosion. Therefore, sufficient attention must be paid to the ambient temperature in which the material will operate when selecting materials and determining operating conditions. It is particularly important to prevent the temperature from exceeding the specified limit during use. When corrosion problems are difficult to resolve, lowering the temperature appropriately, if possible, can achieve twice the result with half the effort.