【摘要】：目的通過在生產(chǎn)廢水中加入緩蝕劑,減少廢水中氯離子的腐蝕性能,使其成為生產(chǎn)中的冷卻水,實現(xiàn)節(jié)能環(huán)保。方法采用失重法,研究廢水溫度對Q235鋼腐蝕速率的影響,確定廢水的腐蝕溫度。研究L-抗壞血酸和L-半胱氨酸在廢水中的最佳用量,制備成復(fù)配緩蝕劑,研究復(fù)配緩蝕劑膜形成的最佳時間。用塔菲爾曲線、陽極極化曲線及交流阻抗法,研究存在與不存在復(fù)配緩蝕劑膜的Q235鋼的自腐蝕電流密度、極化腐蝕電流密度和極化阻抗。用SEM研究復(fù)配緩蝕劑膜腐蝕前后的形貌變化。結(jié)果在60℃的生產(chǎn)廢水中,L-抗壞血酸的最佳用量為165 mg/L,L-半胱氨酸的最佳用量為18 mg/L,復(fù)配緩蝕劑膜的形成時間為24h。無緩蝕劑膜時,Q235鋼的自腐蝕電流密度為4.918×10-5 A/cm~2;在500 m V過電位下,極化腐蝕電流密度為1.667×10-2 A/cm~2,極化阻抗為529?×cm~2。形成復(fù)配緩蝕劑膜的Q235鋼片的自腐蝕電流密度為3.433×10-7 A/cm~2,極化腐蝕電流密度為4.132×10-6 A/cm~2,極化阻抗很大。復(fù)配緩蝕劑的緩蝕率為80.15%,明顯高于單一緩蝕劑。SEM測試表明,在過電位為500 m V時,無緩蝕劑膜的Q235鋼腐蝕十分嚴(yán)重,有復(fù)配緩蝕劑膜的Q235鋼幾乎不腐蝕。結(jié)論在PVC熱穩(wěn)定劑生產(chǎn)廢水中加入適量的緩蝕劑,具有較好的緩蝕性能,基本滿足作為冷卻水的要求。
[Abstract]:Aim to reduce the corrosion performance of chloride ion in wastewater by adding corrosion inhibitor in wastewater, so as to make it become cooling water in production, and realize energy saving and environmental protection. Methods the influence of wastewater temperature on the corrosion rate of Q235 steel was studied by weight loss method, and the corrosion temperature of wastewater was determined. The optimum dosage of L-ascorbic acid and L-cysteine in wastewater was studied. The self-corrosion current density, polarization corrosion current density and polarization impedance of Q235 steel with and without corrosion inhibitor film were studied by Tafer curve, anodic polarization curve and AC impedance method. The morphology changes of composite corrosion inhibitor film before and after corrosion were studied by SEM. Results at 60 鈩，

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