發(fā)布時(shí)間：2018-05-30 03:13

  本文選題：耐候鋼 + 氧化皮　； 參考：《金屬學(xué)報(bào)》2017年02期

【摘要】：采用XRD、電化學(xué)測(cè)量和掃描電子顯微術(shù)研究了耐候鋼在400~700℃不同時(shí)間、不同氧流量條件下形成的氧化皮的結(jié)構(gòu)及其對(duì)隨后的大氣腐蝕行為的影響,發(fā)現(xiàn)氧化皮的主要組成為Fe3O4和Fe2O3。氧化皮的電阻遠(yuǎn)高于裸鋼表面的氧化膜,并使樣品的自腐蝕電位顯著上升。氧化皮分為內(nèi)外兩層,外層疏松,內(nèi)層致密,氧化皮的保護(hù)性主要來自內(nèi)層。致密的氧化皮形成于500~600℃。延長(zhǎng)等溫時(shí)間有利于提高氧化皮的致密度。限氧條件下進(jìn)行氧化處理不利于氧化皮致密化。致密的氧化皮在腐蝕初期明顯延緩了大氣腐蝕進(jìn)程,但在長(zhǎng)期腐蝕過程中,反而使腐蝕進(jìn)程有所加快。這些結(jié)果表明,致密的氧化皮在腐蝕過程中難以轉(zhuǎn)化為腐蝕產(chǎn)物,保留于銹層中成為雜質(zhì)和缺陷,促進(jìn)了腐蝕。
[Abstract]:The structure and the effect of oxygen flow rate of weathering steel on atmospheric corrosion behavior were studied by XRD, electrochemical measurement and scanning electron microscopy. It was found that the main composition of the oxide layer was Fe3O4 and Fe _ 2O _ 3. The resistance of the oxide layer is much higher than that of the oxide film on the bare steel surface, and the corrosion potential of the sample increases significantly. The outer layer is loose, the inner layer is dense, and the protective layer is mainly from the inner layer. The dense oxide layer was formed at 600 鈩，

本文編號(hào)：1953660