【摘要】：用丙烯酰胺(AA)單體對木薯淀粉(CS)進(jìn)行接枝共聚化學(xué)改性,合成了木薯淀粉接枝共聚物(CSGC),采用失重法和電化學(xué)法研究了CSGC對冷軋鋼在羥基乙酸溶液中的緩蝕性能。結(jié)果表明:CSGC能有效抑制冷軋鋼在羥基乙酸中的腐蝕;緩蝕率隨CSGC添加量的增大而不斷上升,緩蝕率會隨著溫度的上升和浸泡時間的延長而下降,緩蝕率隨著羥基乙酸質(zhì)量濃度的增加呈先上升后下降的趨勢。20℃時100 mg/L CSGC在0.3 mol/L羥基乙酸中浸泡24 h緩蝕率(失重法)高達(dá)92.1%,浸泡時間延長至72 h緩蝕率可達(dá)到89.13%。20~50℃時CSGC在0.3 mol/L羥基乙酸中的鋼表面吸附符合Langmuir等溫式,吸附焓(ΔH~Θ)為-23.8 k J/mol、吸附Gibbs自由能(ΔG~Θ)為-28.3~-28.9 k J/mol、吸附熵(ΔS~Θ)為15.4~16.8 J/(mol·K)。羥基乙酸中CSGC在鋼表面發(fā)生物理吸附/化學(xué)吸附的混合吸附,且吸附伴隨熵增加的放熱過程。在0.3 mol/L羥基乙酸中CSGC為符合"幾何覆蓋效應(yīng)"機(jī)理的混合抑制型緩蝕劑;由Nyquist圖譜顯示,鋼/羥基乙酸界面上存在H_2O、H~+、HOCH_2COO~-和CSGC的吸附/脫附過程,CSGC通過擠走水分子發(fā)生吸附。
[Abstract]:Cassava starch (CS) was synthesized by grafting copolymerization of cassava starch (CS) with acrylamide (AA) monomer. The corrosion inhibition performance of CSGC on cold rolled steel in glycolic acid solution was studied by weight loss method and electrochemical method. The results show that CSGC can effectively inhibit the corrosion of cold rolled steel in glycolic acid. The corrosion inhibition rate increased with the increase of CSGC content, the corrosion inhibition rate decreased with the increase of temperature and soaking time, and the corrosion inhibition rate increased at first and then decreased with the increase of glycolic acid concentration. At 20 鈩，

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