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首页> 外文期刊>Journal of Applied Electrochemistry >Inhibitory mechanism of low-carbonsteel corrosion by mimosa tannin in sulphuric acid solutions
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Inhibitory mechanism of low-carbonsteel corrosion by mimosa tannin in sulphuric acid solutions

机译：含羞草单宁在硫酸溶液中对低碳钢的缓蚀机理

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Mimosa tannin was investigated as inhiibtor of low-carbonsteel sulphuric acid corrosion in concentations from 10~(-5) to 10~(-1) mol L~(-1),at the temperature of 298 K in the solutions of pH 1,2 and 2.The inhibitor effectiveness increases with increase in concentration.The adsorptive behaviour of mimosa tannin in solutions of pH 1 and 2 may be approximated,both by Temkin and Frumkin type isotherms,probably due to the chemisorption of tannin molecules on the metal surface.The free energies of adsorption are in the range from -35.1 to 39.5 kJ mol~(-1).At pH 3,a Freundlich type isotherm is obeyed,probably due to the physisorption of ferric-tannate that forms at this pH,both on the metal surface and in the bulk electorlyte.The free energy of adsorption at this pH 3 is -11.8 kJ mol~(-1).The activation energy of the iron dissolution process at pH 1 was found to be 51.4kJ mol~(1) and decreased to 48.0kJ mol~(-1) on the addition of 1.25*10~(-2)mol L~(-1) mimosa tannin.The addition of the same amount of mimosa tannin intosolutions of pH 2 and 3,increased theactivation energy of iron dissolution from 15.6 to 34.3 kJ mol~(-1) and from 12.0 to 19.2 kJ mol`(-1),respectively.
机译：研究了含羞草单宁在10〜（-5）到10〜（-1）mol L〜（-1）浓度下在298 K温度，pH 1溶液中作为低碳钢硫酸腐蚀的抑制剂。 2和2.抑制剂的有效性随浓度的增加而增加。含羞草单宁在pH 1和2的溶液中的吸附行为可能近似于Temkin和Frumkin型等温线，可能是由于单宁分子在金属表面上的化学吸附吸附的自由能在-35.1至39.5 kJ mol〜（-1）范围内。在pH 3时，遵循Freundlich型等温线，这可能是由于在此pH下形成的鞣酸铁的物理吸附pH值为3时，吸附自由能为-11.8 kJ mol〜（-1），pH为1时铁溶解过程的活化能为51.4kJ mol〜（ 1）并在添加1.25 * 10〜（-2）mol L〜（-1）含羞草单宁时降至48.0kJ mol〜（-1）。 pH 2和3的含羞草单宁含量增加，铁溶解的活化能分别从15.6 kJ mol〜（-1）和12.0 k9.2 mol·（-1）增至19.2 kJ mol`（-1）。

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