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Influence of HCl and water vapour on the corrosion kineticsof Fe beneath molten ZnCl2/KCl

机译:HCl和水蒸气对熔融ZnCl2 / KCl下Fe腐蚀动力学的影响

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摘要

Heat exchanger tubes in waste-fired boilers are usually covered by solid and molten salts,formed by condensation of aerosols within the flue gas. The presence of salts accelerates thecorrosion process, especially if they are associated with the formation of melts on the materialsurface or in the oxide scales. But also corrosive gas species in the flue gases like HCl andH2O are known to accelerate the corrosion kinetics by suppling more oxidant.This report focuses on investigations on the influence of HCl and H2O on the kinetics of hightemperature corrosion of pure Fe beneath a molten chloride deposit.Thermogravimetric (TG) experiments were conducted on pure Fe with a 50 mol.% KCl - 50mol.% ZnCl2-salt mixture (15 mg/cm2) at T=320 ℃ in an Ar - O2 atmosphere with additionalH2O and HCl.TG tests carried out on pure Fe covered with KCl - ZnCl2 yield enhanced mass gain foratmospheres containing HCl in comparison to TG tests without HCl. This effect will bediscussed with respect to incubation time and overall kinetics. Results showing the influenceof water vapour are presented as well.
机译:废气锅炉中的热交换器管通常被固体盐和熔融盐覆盖,这些盐是由烟气中的气溶胶冷凝形成的。盐的存在会加速腐蚀过程,特别是如果盐与材料表面或氧化物垢上的熔体形成有关。但是众所周知,烟道气中的腐蚀性气体种类(如HCl和H2O)通过提供更多的氧化剂来加速腐蚀动力学。本报告着重研究HCl和H2O对熔融氯化物沉积下纯铁高温腐蚀动力学的影响。 。在纯铁与50 mol%KCl-50 mol。%ZnCl 2-盐混合物(15 mg / cm 2)下,在T = 320℃的Ar-O 2气氛中进行热重(TG)实验,并附加H 2 O和HCl。与不含HCl的TG试验相比,在用KCl-ZnCl2覆盖的纯Fe上进行的测试可提高含有HCl的大气层的质量增益。关于孵育时间和整体动力学将讨论这种效果。还给出了显示水蒸气影响的结果。

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  • 来源
    《Eurocorr 2004》|2004年|1-9|共9页
  • 会议地点 Nice(FR)
  • 作者单位

    Max-Planck-Institut für Eisenforschung GmbH (MPIE) Max-Planck-Str. 1 D-40237 Düsseldorf Germany e-mail: ruh@mpie.de;

    Max-Planck-Institut für Eisenforschung GmbH (MPIE) Max-Planck-Str. 1 D-40237 Düsseldorf Germany;

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  • 关键词

    Hot corrosion; molten chloride; pure iron; HCl; water vapour;

    机译:热腐蚀;熔融氯化物纯铁盐酸;水蒸气;

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