Abstract
Possible susceptibility of advanced high strength steels (AHSSs) to hydrogen embrittlement in atmospheric environments is becoming an important issue. It is known that hydrogen can be generated by cathodic reaction during corrosion in service conditions. Scanning Kelvin probe (SKP) technique was used for in situ monitoring of hydrogen entry induced by local chloride deposition and exposure to humidified air. Specimens of bare and zinc galvanized DP1000 steel with and without different types of artificial defects in the coating were studied. Differences in hydrogen uptake were analysed in view of corrosion reactions occurring on the hydrogen entry side of the specimens. Defects in zinc coatings enhanced hydrogen entry compared to bare steel. Hydrogen entry to specimens with intact zinc coatings was delayed but similar to bare steel in quantity.