酸洗对超薄壁1Cr18Ni9Ti不锈钢腐蚀行为研究

Corrosion Behavior of 1Cr18Ni9Ti Stainless Steel Ultra-thin-walled Product During Acid Pickling

1Cr18Ni9Ti不锈钢带在不同浓度硝酸−氢氟酸中进行酸蚀试验,进行力学性能检测和金相组织观察,探索酸洗各因素对超薄壁不锈钢腐蚀的影响。结果表明:酸洗对敏化态不锈钢带的腐蚀影响最严重;酸蚀剂中HNO3浓度低于20%时,HF浓度越高,不锈钢带腐蚀速率越大;HNO3浓度高于30%时,随HF浓度增加,不锈钢带力学性能降低,但腐蚀速率变化不明显;超薄壁1Cr18Ni9Ti不锈钢的酸蚀剂宜采用较高浓度的硝酸和较低浓度的氢氟酸。

The corrosion test of 1Cr18Ni9Ti stainless steel sheets was carried out in nitric-hydrofluoric acid of different concentrations,and then mechanical property test and microstructure observation were performed to explore the influence of various factors of acid pickling on the corrosion of ultra-thin-walled stainless steel sheets.The results show that acid pickling brings the most serious corrosion to sensitized stainless steel sheets.When the concentration of nitric acid in the etching agent is less than 20%,the higher the concentration of hydrofluoric acid,the higher the corrosion rate of stainless steel sheets is.When the concentration of nitric acid is higher than 30%,the mechanical properties decrease with the increase of hydrofluoric acid concentration,but the corrosion rate does not change significantly.Higher concentration of nitric acid and lower concentration of hydrofluoric acid should be used as the etching agent for ultra-thin-walled 1Cr18Ni9Ti stainless steel sheets.