發(fā)布時間：2018-06-03 03:23

  本文選題：QD低合金鋼 + 腐蝕�。� 參考：《機械工程學(xué)報》2016年20期

【摘要】：通過在青島海域2年實海掛片暴露試驗研究Q345D低合金鋼和對比材料Q235B普碳鋼在潮差區(qū)的腐蝕行為。試驗結(jié)果表明,Q345D鋼在實海潮差區(qū)1年和2年周期的平均腐蝕速率都小于Q235B鋼,且兩種鋼銹層組成和結(jié)構(gòu)基本類似,但Q345D鋼表面銹層較厚,且更致密均勻。通過室內(nèi)模擬海水周浸腐蝕試驗研究兩種鋼的初期腐蝕行為,通過腐蝕數(shù)據(jù)的回歸擬合分析得出,在腐蝕起始階段,Q345D鋼與Q235B鋼的腐蝕傾向差別不大,但隨著周浸時間的延長,腐蝕速率逐漸降低,且Q345D鋼表現(xiàn)出比Q235B更好的耐全面腐蝕性能。宏觀電化學(xué)阻抗譜和微區(qū)阻抗譜測試結(jié)果也證實,Q345D低合金鋼形成的腐蝕產(chǎn)物膜層具有比Q235B鋼更高的膜層電阻,且能夠在更短時間內(nèi)形成穩(wěn)定的腐蝕產(chǎn)物膜層。
[Abstract]:The corrosion behavior of Q345D low alloy steel and contrast material Q235B plain carbon steel in the tidal zone was studied by exposure test in Qingdao sea area for 2 years. The results show that the average corrosion rate of Q345D steel in the real tidal zone is lower than that of Q235B steel for 1 and 2 years, and the composition and structure of the rust layer of the two steels are similar, but the rust layer on the surface of Q345D steel is thicker and more compact and uniform. The initial corrosion behavior of the two steels was studied by simulated seawater cyclic immersion corrosion test in laboratory. Through regression fitting analysis of corrosion data, it was concluded that the corrosion tendency of Q345D steel and Q235B steel was not different from that of Q235B steel at the initial stage of corrosion, but with the prolongation of the cycle leaching time, the corrosion behavior of the two steels was studied. The corrosion rate of Q345D steel decreased gradually, and the overall corrosion resistance of Q345D steel was better than that of Q235B. The results of macroscopic electrochemical impedance spectroscopy and micro-area impedance spectroscopy also confirmed that the corrosion product film formed by Q345D low alloy steel has higher film resistance than Q235B steel and can form a stable corrosion product film in a shorter time.
【作者單位】： 北京科技大學(xué)腐蝕與防護中心;北京科技大學(xué)腐蝕與防護教育部重點實驗室;中國科學(xué)院寧波材料技術(shù)與工程研究所;
【基金】：國家自然科學(xué)基金(51271031) 國家重點基礎(chǔ)研究發(fā)展計劃(973計劃,2014CB643300) 國家科技基礎(chǔ)條件平臺(2005DKA10400)資助項目
【分類號】：TG172

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