has to 的理解(酸性腐蚀)? 关于H2S的腐蚀开裂,标红的has to如何理解。 One of the hydrogen embrittlement phenomena. H2S (in fact adsorbed HS-) promotes penetration in steel of H produced by corrosion on surface. A contact of liquid water with the steel surface is necessary for the damage risks to exist. This water has to produce acidic corrosion (with H formation on cathodic zones), therefore must contain acidic species like CO2 or H2S (influence of pH). H2S concentration in this water must be sufficient to produce enough H flux into steel (influence of PH2S). 查看更多9个回答 . 5人已关注