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首页> 外文期刊>British Corrosion Journal >Optimisation of conversion coatings in phosphoric acid media using statistical experimental designs
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Optimisation of conversion coatings in phosphoric acid media using statistical experimental designs

机译：使用统计实验设计优化磷酸介质中的转化膜

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摘要

The process conditions used to produce conversion coatings on stainless steel as the basis for subsequent ceramic deposits have been optimised using statistical experimental designs. These conversion coatings should possess strong interfacial adhesion and must be highly porous; the specific area of the coatings has been measured by an electrochemical method. The effects of all influencing factors including temperature, time, and bath composition (acid, accelerators, and inhibitors), and also the interactions between these factors were evaluated using 25-1 fractional factorial design. To optimise the conversion coating, a methodological approach was supported by a Doehlert experimental design and the simplex method. The most important factors were found to be the concentrations of phosphoric acid, thiosulphate, and alcohol. The growth of the conversion coating was also influenced by the effects of interactions between other components of the bath. Under the conditions optimised in this manner, the real surface area obtained was about 100 m2 m-2. This conversion coating, modified by an alumina deposit, increases the thermal oxidation resistance of the stainless steel. A discussion of the use of experimental designs for the optimisation of conversion coating processes is also presented.
机译：使用统计实验设计优化了用于在不锈钢上生产转化膜作为后续陶瓷沉积物基础的工艺条件。这些转化膜应具有很强的界面粘合力，并且必须是高度多孔的；涂层的比表面积已通过电化学方法测量。使用2 5-1 分数阶乘设计评估了所有影响因素的影响，包括温度，时间和浴液组成（酸，促进剂和抑制剂），以及这些因素之间的相互作用。为了优化转化膜，Doehlert实验设计和单纯形法支持了一种方法学方法。发现最重要的因素是磷酸，硫代硫酸盐和酒精的浓度。镀液其他组分之间相互作用的影响也影响转化膜的生长。在以这种方式优化的条件下，获得的实际表面积约为100 m 2 m -2 。通过氧化铝沉积层进行改性的这种转化膜提高了不锈钢的抗热氧化性。还介绍了使用实验设计优化转化涂层工艺的讨论。

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  • 来源
    《British Corrosion Journal》 |1999年第4期|273-279|共7页
  • 作者

    El Hajjaji S.; Maurette M.-T.; Puech-Costes E.; Ben Bachir A.; Aries L.;

  • 作者单位

    The Laboratoire des Matériaux (UPRESA CNRS 5071), Ecole Nationale Superieure de Chimie (INP), 118 Route de Narbonne, Toulouse, France;

    The Laboratoire des IMRCP, Groupe POM, UniversitéPaul Sabatier, 118 Route de Narbonne, Toulouse, Cedex 4, France;

    The Laboratoire des IMRCP, Groupe POM, UniversitéPaul Sabatier, 118 Route de Narbonne, Toulouse, Cedex 4, France;

    The Laboratoire de Chimie Physique Appliquée (section Electrochimie–Corrosion), Departement de Chimie, Rabat, Morocco;

    The Laboratoire CMIE, Université Paul Sabatier, Toulouse, France;

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