IF鋼在不同酸液中之腐蝕行為

Corrosion Behavior of IF Steel in Various Acid Solutions

黃聿明(Y.M. Huang) ； 吳臺一(T.I. Wu)

《鑛冶：中國鑛冶工程學會會刊》 48卷1期 (2004/03) Pp. 136-142+34

https://doi.org/10.30069/MM.200403_48(1).0010

摘要

本文旨在研究IF鋼於不同酸液中之腐蝕行為，結果發現：IF鋼於鹽酸溶液中之腐蝕速率隨鹽酸濃度之增加而增加。12M之硝酸溶液對IF鋼具最強腐蝕性，而最低（0.1M）及最高（16M）濃度之硝酸溶液對IF鋼之腐蝕性則相對較弱。硫酸對IF鋼之腐蝕速率則由低濃度至高濃度呈現極大變化，當硫酸濃度由0.1M漸增至3M時腐蝕速率亦隨之增加，爾後腐蝕速率減小，至硫酸濃度為8M時反而呈現極大之重量增加。以XRD分析表面腐蝕層未見明顯繞射峰，惟採用EDS結合FTIR分析得知H_2SO_4／8M-24hrs.情況下試片表面之腐蝕層為Fe_3O_4。由SEM觀察發現腐蝕速率較大之條件，如HC1／12M-1min.及HNO_3／12M-1min.處理過後，試片表面出現特定結晶方位之蝕孔。由本研究之初步成果發現：室溫下可以利用中等濃度（如8M）之硫酸液來處理鋼鐵，使之表面生成一緻密之氧化鐵（Fe_3O_4）被覆層，達到防蝕之效果。

關鍵字

IF鋼 ； 硫酸 ； 鹽酸 ； 硝酸 ； 腐蝕速率 ； SEM ； 氧化鐵 ； FTIR ； XRD

並列摘要

IF (interstitials free) steel was processed in various aqueous acid solutions to observe the corrosion behavior. The corrosion rate of IF steel in HCI_((aq)) increases with the concentration of HCl. HNO_(3(aq)) with concentration of 12M was observed to be the most aggressive for IF steel. The corrosion rate of IF steel in H_2SO_4, solution increases as the concentration of H_2SO_4 increases from 0.1M to 3M and then decreases gradually with the concentration. A large amount of weight gain even observed when the concentration was 8M. The protective layer produced during H_2SO_4/8M-24hrs. treatment was analyzed to be Fe_3O_4 by using SEM (Scanning Electron Microscope), EDS (Energy Dispersive Spectroscopy) and FTIR (Fourier Transform Infrared). Etch pits with crystallographic symmetry were observed on the specimens treated with conditions HCI/12M-1min. and HNO_3/12M-1min. Processing condition H_2SO_4/8M-24hrs. could be employed in corrosion prevention for IF steel under ambient conditions.

並列關鍵字

IF Steel ； H_2SO_4 ； Hcl ； HNO_3 ； Corrosion rate ； SEM ； Fe_3O_4 ； FTIR ； XRD