加速腐蝕環(huán)境下鋼板表面坑蝕形貌統(tǒng)計(jì)規(guī)律

王皓　徐善華　蘇磊

摘要：采用光學(xué)表面測量技術(shù)對實(shí)驗(yàn)室加速腐蝕鋼板試件進(jìn)行坑蝕表面數(shù)據(jù)采集，通過建立不同齡期的銹蝕鋼板表面形貌圖討論了銹蝕鋼板表面點(diǎn)蝕特征隨腐蝕時間的變化趨勢。對于以局部腐蝕為主的銹蝕鋼板，通過計(jì)算證明坑蝕平均深度近似等于腐蝕平均深度，且其隨時間的變化趨勢可以采用新型weibull函數(shù)加以描述。經(jīng)過對垂直于鋼板受力方向的坑蝕截面損失率進(jìn)行探究，指出可以利用正態(tài)分布模型表征其隨機(jī)分布規(guī)律，并建立了模型參數(shù)與坑蝕平均深度之間關(guān)系式。最后討論了與腐蝕時間相關(guān)的鋼板屈服強(qiáng)度退化概率模型。

關(guān)鍵詞：銹蝕鋼板；形貌圖；坑蝕平均深度；坑蝕截面損失率

中圖分類號：TU391

文獻(xiàn)標(biāo)志碼：A文章編號：16744764（2016）01002307

Abstract：

We used the optical surface measurement technology to collect the pitting surface data of steel plate specimens subjected to laboratory accelerated corrosion， and discussed on trends of pitting characteristics with the increase of corrosion time by establishing 3D contour pictures of surface data of corroded steel with different corrosion time. For the corroded steel plate mainly with local corrosion， calculations showed that the average depth of pitting corrosion was approximately equal to the average depth of corrosion， and the tendency of the average depth of pitting corrosion with time could be described by a new Weibull function. The pitting section loss ratio， which was perpendicular to the force direction of steel plate， showed a normal distribution， and the relationship between the model parameters and the average depth of pitting corrosion was established. The probabilistic yield strength deterioration model relating to the corrosion ratio was discussed.

Keywords：corrosion of steel； contour pictures； average pitting depth； pitting section loss ratio

隨著鋼產(chǎn)量的增加與鋼結(jié)構(gòu)設(shè)計(jì)理論的日益成熟，中國鋼結(jié)構(gòu)工程的數(shù)量和規(guī)模逐年增加。然而鋼結(jié)構(gòu)耐久性差，長期處于海洋、工業(yè)大氣等腐蝕環(huán)境下的鋼結(jié)構(gòu)工程極易出現(xiàn)腐蝕問題。鋼結(jié)構(gòu)腐蝕導(dǎo)致鋼材在環(huán)境作用下發(fā)生損壞和性能下降，其腐蝕具有破壞性，致使建筑物承載力衰退，甚至還會引發(fā)倒塌而造成生命財(cái)產(chǎn)的巨大損失，因此，如何對鋼結(jié)構(gòu)腐蝕構(gòu)件進(jìn)行安全性評估已成為各國學(xué)者研究的一個重要課題，其中銹蝕鋼材的腐蝕退化規(guī)律是最為基礎(chǔ)而關(guān)鍵的問題之一。

目前，國內(nèi)外學(xué)者對于銹蝕鋼材的腐蝕退化規(guī)律方面已有較多研究，在對鋼筋銹……