Characterization of Rusting Process on Stainless Steels

Izumi Muto, Hiroshi Kihira

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Through the analyses of sensory evaluation of model panels simulating rusted stainless steels, it became clear that perception of human being is affected not only area ratio of spots but also their size and numbers. Based on this result, the quantitative evaluation method to obtain the level of dirtiness was developed using the plot of the density of rusty dots against their area ratio, in which the average size of rust can be calculated from the slope of a straight line connecting each datum point and the origin. Furthermore, it was found that the points of the same aesthetic category are plotted in a zone limited by straight lines with slope of ca. —1. By this approach, three stages of weathering process of stainless steels are first characterized as follows; (1) nucleation of pits from which increase in the number of small spots ensue, (2) expansion of individual rusty dots, and (3) coalescence. Aesthetic degradation of the stainless steels is appreciable up to the stage (2), while not so noticeable when in the process (3).

Original languageEnglish
Pages (from-to)442-447
Number of pages6
Issue number8
Publication statusPublished - 1995 Jan 1
Externally publishedYes


  • atmospheric corrosion
  • cyclic corrosion test
  • digital image processing
  • morphology
  • rusting
  • sensory evaluation
  • stainless steel

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrochemistry
  • Materials Chemistry


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