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本文用分光光度法研究A3钢在硫酸溶液C(1/2H_2SO_4)=1.0mol·dm~(-3)中的腐蚀速率、硫脲对低碳钢-硫酸体系的缓蚀作用、Hg~(2+)、Sn~(2+)、Cd~(2+)等阳离子对A3钢在浓度C(1/2H_2SO_4)=1.0mol·dm~(-3)的硫酸溶液中腐蚀速率和硫脲的缓蚀作用的影响。在25.6℃至55.5℃范围内,硫脲的缓蚀作用随浓度的上升而增强。当浓度达到C(CH_4N_2S)=2×10~(-3)mol·dm~(-3)后,缓蚀率达到极限值。表面反应为腐蚀速率的控制步骤,硫脲在低碳钢表面上的吸附符合Freundlich等温方程式。Hg~(2+)及Sn~(2+)是硫脲的协同缓蚀剂,而Cd~(2+)对硫脲的缓蚀率无影响。
In this paper, the corrosion rate of A3 steel in sulfuric acid solution C (1 / 2H_2SO_4) = 1.0mol · dm -3, the corrosion inhibition effect of thiourea on mild steel-sulfuric acid system, The corrosion rate and thiourea concentration of A3 steel in sulfuric acid solution with concentration of C (1 / 2H_2SO_4) = 1.0mol · dm -3 were studied by means of C + +, Sn ~ (2 +) and Cd ~ Effect of erosion. The corrosion inhibition of thiourea increased with increasing concentration from 25.6 ℃ to 55.5 ℃. When the concentration reached C (CH4N2S) = 2 × 10 -3 mol · dm -3, the corrosion inhibition rate reached the limit value. The surface reaction is the control step of the corrosion rate. The adsorption of thiourea on mild steel surface accords with the Freundlich isotherm equation. Hg2 + and Sn2 + are synergistic corrosion inhibitors of thiourea, while Cd2 + has no effect on the inhibition rate of thiourea.