Maishi stainless steel has good corrosion resistance, can be made to pitting corrosion and uniform corrosion resistance, high strength, good toughness, and is widely used in construction, pipelines and so on.
Galvanized steel pipes in desalinated seawater are highly corrosive, so it is now considered to use stainless steel instead of galvanized steel as a desalinated seawater pipeline. At present, the corrosion behavior of stainless steel in seawater has been reported more, but it is less in desalinated seawater. It is of great significance to study the corrosion behavior of stainless steel in desalinated seawater pipelines. Researchers in a company used electrochemical and slow strain rate stretching methods combined with scanning electron microscopy to study the corrosion resistance of 304 stainless steel in desalinated seawater, and analyzed the effect of temperature on the corrosion resistance of stainless steel passivation film.
Testing 304 stainless steel in seawater environment
The test material was 304 stainless steel, chemical composition (mass fraction, %): C0.080, Mn2.000, Si1.000, S0.031, P0.027, Ni8.050, Cr17.500, and the balance was Fe. The size of the electrochemical sample is 10mm×10mm×3mm. The copper wire is welded on one side and encapsulated with epoxy resin. The other side is the working surface. It is ground with 600, 800, 1000 sandpaper, and then de-oiled with acetone and then dried. Into the drying dish for use. The stress corrosion tensile test is a dumbbell-shaped structure, Φ5 mm, and the intermediate test portion is 20 mm long.
The medium is a first-grade reverse osmosis desalinated seawater with a Cl-concentration of 312.5 g/m3, a pH of 7.8-8.2, a conductivity of 0.8 mS/cm, and a temperature of 35, 50, and 70 °C, respectively.
Therefore, the above experimental results show that the maishi stainless steel mesh 304 material is more advantageous than the galvanized steel pipe seawater use
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