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。
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.