Application of 15-5PH Stainless Steel Fasteners in High Seawater Salt Fog Environment
The C01 type diaphragm coupling is exposed to high concentrations of seawater salt spray for a long time during operation.The fastener material of the coupling should not only have high mechanical properties,but also have strong resistance to seawater salt spray corrosion.The feasibility of using 15-5PH(0Cr15Ni5Cu4Nb)stainless steel material for diaphragm coupling fasteners was tested through tests such as pitting corrosion,crevice corrosion,stress corrosion,fatigue corrosion,and galvanic corrosion.The results indicate that 15-5PH stainless steel exhibited significant crevice corrosion and slight pitting corrosion,but had no stress corrosion or fatigue corrosion sensigbility.When coupled with TC4 titanium alloy,15-5PH stainless steel had no electrochemical corrosion.15-5PH stainless steel could be used as a fastener for TC4 titanium alloy membrane discs in open marine environments.But attention should be paid to avoiding the occurrence of crevice corrosion.
15-5PH stainless steelcoupling fastenerseawatersalt fogcorrosion resistance test
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