Effect of SRB on hydrogen permeation of hot-dip galvanized steel
硫酸盐还原菌对热镀锌钢材氢渗透行为的影响

Hydrogen permeation testing with Devanathan-Stachurski cell and SEM analytical method were used to study the hydrogen permeation behavior of hot-dip galvanized steel in sterilized seawater, sterilized medium and medium inoculated with SRB. The results showed hydrogen permeation behavior of galvanized steel was promoted by some components of the medium. The average hydrogen permeation current density of the sample in sterilized medium was 6 times higher than which in sterilized seawater. The compact film formed by SRB, metabolites of SRB and corrosion products decreased the hydrogen adsorption of the sample although S2? and HS? produced by active SRB could promote the hydrogen peameation behavior, which resulted in the average hydrogen permeation current density of galvanized steel in medium inoculated with SRB 77% lower than which in sterilized medium. SEM results showed few products adhered on the sample immersed in sterilized medium, but a film of corrosion products was formed on the sample immersed in sterilized seawater, and a biofilm of SRB and its metabolites together with the film of corrosion products was formed on the the sample immersed in medium inoculated with SRB, indicating a obvious relation between the biofilm and hydrogen permeation of galvanized steel.