| Summary: | 碩士 === 國立海洋大學 === 船舶機械工程學系 === 82 === It is well known that steels are susceptible to hydrogen
degradation and corrosiondamage in wet sulfide environment.
Approachs employed by researchers to minimize the hydrogen
embrittlement problem include materials selection,design,in-
hibitors,surface modification and control of microstructure.
Currently, inhibitors are extensively used for various types of
corrosion, but the use of inhibitor is an undeveloped
control technique for hydrogen embrittlement. In this study,
electrochemical hydrogen permeation technique was used to
evaluate the effect of the addition of sixteen chemical
additives on hydrogen absorption in steel to improve the
hydrogen embrittlement resistance. A corrosion measurement
was also performed to search for an effective inhibitors for
both corrosion control and hydrogen degradation in wet
sulfide environments. The permeation results show that
addition of ferric , ferrous , copper , zinc and nickel
ions to wet sulfide environments are benefitial for
hydrogen embrittlement resistance of steel, but ferric ,
copper and nickel ions may cause the accelerated corrosion of
steel.Hydrogen permeation data are slightly affected by
addition of manganese, magnesium, calcium, chloride, sulfate
and thiosulfate ions. Vanadium pentoxide exhibits a hydrogen
poison effect for steel. Chromate , molybdate and thiourea are
corrosion inhi- bitors, also show cathodic poison effect.
|
|---|
