Pitting corrosion of ASTM A240 201 AUSTENITIC stainless steel

Pitting corrosion results in the formation of needle-like pits on the surface of ASTM A240 201 AUSTENITIC stainless steel and the inward expansion from the surface to form voids. This corrosion is detrimental to the corrosion perforation of ASTM A240 201 AUSTENITIC stainless steel with less uniform corrosion.

Media factors affecting ASTM A240 201 AUSTENITIC stainless steel pitting corrosion include the following:

 1. Acidity  

ASTM A240 201 AUSTENITIC stainless steel experiments in 4% NaCi solution show that the number of pits is the largest and the depth is the largest in the range of pH=4~8. The corrosion resistance of stainless steel with higher alloy content in acid solution is more serious than neutral.

2. Oxygen content

The presence of oxygen is a necessary condition for the development of pitting corrosion. Oxygen depolarization as a cathode can accelerate corrosion.

3. Chloride content

4. Temperature

Increasing the temperature can accelerate the pitting corrosion, but the temperature rise to above 80 degrees Celsius in the atmosphere has the effect of weakening the pitting corrosion because the dissolved chlorine content is decreased.

5. Flow rate

The point sensitivity is the highest in the dissolution of static chloride. It is generally considered that the sensitivity is greatly reduced when the flow rate exceeds 1.5m/s.

6. Impurities

The most common sulfur in port water has a special effect on the improvement of pitting corrosion sensitivity.

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