CAJ | 학술논문

目的：研究在含S2-的铝酸钠溶液中Q235钢的腐蚀行为。方法模拟生产条件配制种分母液,采用盐雾腐蚀实验与SEM和EDS分析技术,结合腐蚀质量损失动力学方程与极化曲线,研究Na2 S质量浓度与时间对Q235钢腐蚀行为的影响。结果腐蚀产物元素主要为O,S,Al,Fe。在铝酸钠溶液中,基体的表面会覆盖一层Al2 O3保护膜,可以阻碍溶液中的硫离子穿透到基体表面,对基体起到一定的保护作用。因此腐蚀初期及低质量浓度下,腐蚀速率缓慢；但随着质量浓度的增加、腐蚀时间的延长,保护膜被破坏,S2-穿过保护膜与基体反应,生成硫化物加速了腐蚀速率；当S2-质量浓度增加到6 g/L,腐蚀时间为9 d时,硫化物被氧化成具有较稳定结构的氧化物,腐蚀被抑制。结论在铝酸钠溶液中,S2-质量浓度及腐蚀时间对腐蚀有一定的促进作用,但当腐蚀时间及S2-质量浓度达到一定值时,腐蚀速率呈现减小的趋势,腐蚀被抑制。
목적：연구재함S2-적려산납용액중Q235강적부식행위。방법모의생산조건배제충분모액,채용염무부식실험여SEM화EDS분석기술,결합부식질량손실동역학방정여겁화곡선,연구Na2 S질량농도여시간대Q235강부식행위적영향。결과부식산물원소주요위O,S,Al,Fe。재려산납용액중,기체적표면회복개일층Al2 O3보호막,가이조애용액중적류리자천투도기체표면,대기체기도일정적보호작용。인차부식초기급저질량농도하,부식속솔완만；단수착질량농도적증가、부식시간적연장,보호막피파배,S2-천과보호막여기체반응,생성류화물가속료부식속솔；당S2-질량농도증가도6 g/L,부식시간위9 d시,류화물피양화성구유교은정결구적양화물,부식피억제。결론재려산납용액중,S2-질량농도급부식시간대부식유일정적촉진작용,단당부식시간급S2-질량농도체도일정치시,부식속솔정현감소적추세,부식피억제。
ABSTRACT:Objective To study the corrosion behavior of Q235 steel in the S2--containing sodium aluminate solution. Methods The production conditions were simulated to prepare the mother liquor. Salt spray corrosion method together with SEM and EDS a-nalysis technology, combined with the corrosion weight loss dynamics equation and polarization curve were used to study the effects of the Na2 S concentration and time on the corrosion behavior of Q235 steel. Results The elements of corrosion products were mainly O, S, Al and Fe. In sodium aluminate solution, the surface of the substrate was covered with a layer of Al2 O3 protective film, which could hinder the penetration of sulfur ions in the solution to the substrate surface, and play a role in the protection of the ma-trix. Therefore, in the early corrosion stage and at low concentrations, the corrosion rate was low, but with the increase of the con-centration and the prolonged corrosion time, the protective membrane was damaged, S2-passed through the protective film and reacted with the substrate, generating sulphide which accelerated the corrosion rate. When the S2-mass concentration increased to 6 g/L and the corrosion time was 9 d, sulfide was oxidized to oxide with a relatively stable structure, the corrosion was inhibited. Conclusion In sodium aluminate solution, S2- concentration and corrosion time had a certain promoting effect of corrosion , but when the corrosion time and S2- concentration reached a certain value, the corrosion rate showed a decreasing trend, the corrosion was inhibited.