光沢Ni-Crめっき鋼板の屋外暴露試験による腐食特性についての統計的評価

抄録

Corrosion characteristics of a bright Ni-Cr electroplating system on steel were statistically evaluated. For three thicknesses of Ni, a set of fifteen panels was subjected to outdoor exposure tests. Variation in the corrosion characteristics was based on a probabilistic feature, and may be caused by electrochemical noise and nonequilibrium fluctuations. The time to failure for each panel was estimated from the smoothed curves of the percent area of corrosion. To sample life distribution of individual Ni thicknesses, a Weibull distribution was fitted. The failure mode of the bright Ni-Cr electroplating system was wear-out type of failure. The maximum service life, B₁₀ life, increased logarithmically with increasing Ni thickness.