RELATIONSHIP BETWEEN THE BRITTLEMENT SUSCEPTIBILITY AND H PERMEATION CURRENT FOR UNS G11180 STEEL IN 5-PERCENT NACL SOLUTION WITH H2S

Sulfide stress corrosion cracking (SSCC) behaviour of UNS G11180 steel in 5% NaCl solution with H2S was, studied by slow strain rate tensile test (SSRT), SEM and electrochemical hydrogen permeation technique. T he results reveal different cracking mechanism and H permeation curren t (I-H) through UNS G11180 steel plate in different concentration of H 2S solution. The susceptibility to SSCC of UNS G11180 steel in 5% NaCl solution with H2S was evaluated by the permeation current (I-H, mu A) , which depends on the concentration (c x 10(-6)) of H2S by the equati on: I-H = 8.525 x c(0.7249). It is proved that the electrochemical H p ermeation method is a practical way to assess the susceptibility to SS CC.