Duplex stainless steel is extensively used in these industries because of its high resistance to pitting and crevice corrosion
, stress corrosion cracking in chloride bearing environments, sulfide stress corrosion, very high mechanical strength, and high energy absorption, low coefficient of thermal expansion, and good workability and weldability.
In general a distinction is drawn between general or uniform corrosion and localized corrosion like pitting and crevice corrosion
Several coating systems were prepared to find a coating system that would indicate crevice corrosion
, as can be expected to occur in a nut and bolt assembly designed to duplicate the use of bolts to hold a structure.
often starts at drill-point joints, tubing or casing collars.
At the same time in correspondence of the bottom o-ring of the electrochemical cell extended crevice corrosion
This study confirms that more than 90% of failure of stainless steel implants is due to pitting and crevice corrosion
(8) and pitting corrosion shows only mild improvement with ion implantation, a usual method to increase corrosion resistance in stainless steel implants.
DSS has excellent resistance to carbon dioxide (CO2) but the combination of hydrogen sulphide (H2S) and water-containing chlorides can lead to attack by crevice corrosion
and stress corrosion cracking.
The material offers excellent mechanical strength as well as high levels of resistance to general corrosion and other types such as stress corrosion cracking, and pitting and crevice corrosion
Pitting and Crevice Corrosion
Resistance (ASTM G48 Methods A, B, C, D, E & F)
Virtual corrosion experiments include an exploration of crevice corrosion
on the Titanic.
PITTING: This can result from conditions similar to those for crevice corrosion
For NaCl-containing solutions, such as biological fluids or common industrial waters, it has been found that AISI 316 stainless steel is prone to pitting corrosion(3) and crevice corrosion
caused by local acidification of the solution,(4) in particular, in conditions of high temperature, high NaCl concentration (sea water 3.