All metals or alloys are sensitive to certain environments, or no metal or alloy is unaffected by all environments.For example, gold has been considered to have excellent corrosion resistance since ancient times. However, it can be corroded in mercury at room temperature.Iron, on the other hand, is resistant enough to mercury to corrode easily in the air.

    For a certain application environment, the selection of inappropriate materials will not only cause great waste of costs, but also bring direct and indirect economic losses, including:

1. Replace corrosive equipment;

2. Design of excess allowance allowed by corrosion;

3. Stop the equipment due to corrosion failure;

4. Loss of products caused by container leakage;

5. Product pollution;

6. The formation of corrosion products reduces the heat conduction efficiency of the heat exchanger, resulting in low efficiency.

    These indirect losses, such as the cost of equipment shutdown, are much greater than the cost difference between choosing the right material and the wrong material.Therefore, indirect losses due to corrosion must be considered before material selection.In addition, corrosion is also a major safety risk factor, for example, for the shipment of toxic products (toxins, etc.) containers and transportation of key parts.