磺化烷基酚缓蚀剂的制备及其性能评价

以烷基酚和浓硫酸为原料合成磺化烷基酚，考察了原料配比、反应温度和反应时间对磺化产率的影响；采用红外光谱对产物进行了结构表征；通过旋转挂片失重法测定磺化烷基酚缓蚀剂对A3钢的缓蚀率；并借助数码相机、显微镜及EDS对缓蚀剂成膜物质进行评价。研究结果表明：合成磺化烷基酚的最佳工艺条件为烷基酚与浓硫酸摩尔比1:1.25，反应温度60 ℃，反应时间2 h，此条件下的磺化产率可达90.46%；在缓蚀剂质量浓度1 000 mg/L、腐蚀介质温度280 ℃、腐蚀介质停留时间6 h、搅拌桨转速300 r/min的条件下，磺化烷基酚缓蚀剂对A3钢的缓蚀率为93.27%；磺化烷基酚缓蚀剂能在A3钢表面形成完整致密的保护膜，在以环烷酸为主的腐蚀环境中具有良好的防护作用。

PREPARATION OF SULPHONATED ALKYLPHENOL AND ITS CORROSION INHIBITION PERFORMANCE

Sulphonated alkylphenol was synthesized with alkylphenol (A) and concentrated sulphuric acid (B), and the effect of reaction conditions on the sulphonation rate was studied. The structure of the prepared sulphonated alkylphenol was characterized by means of FT-IR．Rotary weight-loss method，digital camera，microscope and EDS were used to investigate the corrosion inhibition performance of sulphonated alkylphenol．Results showed that under the optimal reaction conditions of B/A mole ratio of 1.25，a reaction temperature of 60 ℃ and a reaction time of 2 h, the yield of sulphonated alkylphenol could reach 90.46%．Sulphonated alkylphenol used as corrosion inhibitors could suppress the corrosion of A3 steel by naphthenic acid effectively, due to the formation of a protected film on the steel surface. The corrosion inhibition rate reached 93.27% under the following conditions: sulphonated alkylphenol concentration of 1 000 mg/L, corrosive medium temperature of 280 ℃，with a stirring speed of 300 r/min and the residence time in corrosive medium was 6 h．