X80管線鋼在連木沁土壤模擬溶液中的腐蝕行為與機理研究
發(fā)布時間:2019-01-03 11:04
【摘要】:采用失重法、電化學測試、表面分析方法,研究了X80母材和焊接熱影響區(qū)(HAZ)在連木沁土壤模擬溶液中的腐蝕行為。結果表明:X80母材和HAZ在上述溶液中浸泡7 d后,腐蝕程度均為中度腐蝕,X80母材的腐蝕速率以及在3、7 d的自腐蝕電流密度都小于HAZ的。與母材相比,HAZ的腐蝕產(chǎn)物表面裂紋更多,外層空隙更大,腐蝕性離子更易到達管材表面,加速腐蝕。在連木沁土壤模擬溶液中,X80母材和HAZ腐蝕產(chǎn)物為Fe_2O_3、Fe S、Fe_(1-x)S、Fe_2O_3·H_2O。另外,土壤中的O_2、SO_4~(2-)和Cl~-對管材的腐蝕起主導作用。X80母材的耐蝕性優(yōu)于HAZ的。X80鋼的腐蝕機制符合陽極溶解。
[Abstract]:The corrosion behavior of X80 base metal and welding heat affected zone (HAZ) in Lianmuqin soil simulated solution was studied by means of weightlessness electrochemical measurement and surface analysis. The results showed that the corrosion degree of X80 base metal and HAZ were moderate after being immersed in the solution for 7 days. The corrosion rate of X80 base metal and the corrosion current density of X80 base metal at 3 ~ 7 days were lower than those of HAZ. Compared with the base metal, the corrosion products of HAZ have more surface cracks and larger outer voids, and the corrosive ions can reach the pipe surface more easily and accelerate the corrosion. In Lianmuqin soil simulated solution, X80 base material and HAZ corrosion products are Fe_2O_3,Fe SznFe1-x SfFe2OS _ 2s _ 3H _ 2O. In addition, O2SO4- and Cl~- in soil play a leading role in corrosion of pipes. The corrosion resistance of X80 base metal is better than that of HAZ steel. The corrosion mechanism of X80 steel accords with anodic dissolution.
【作者單位】: 西安石油大學材料科學與工程學院;
【基金】:國家自然科學基金資助項目(51271146) 陜西省自然科學基金資助項目(2016JQ5068) 陜西省重點學科專項資金資助項目(YS37020203) 陜西省能源化工過程強化重點實驗室資助項目(SXECPI201503)
【分類號】:TG172.4
[Abstract]:The corrosion behavior of X80 base metal and welding heat affected zone (HAZ) in Lianmuqin soil simulated solution was studied by means of weightlessness electrochemical measurement and surface analysis. The results showed that the corrosion degree of X80 base metal and HAZ were moderate after being immersed in the solution for 7 days. The corrosion rate of X80 base metal and the corrosion current density of X80 base metal at 3 ~ 7 days were lower than those of HAZ. Compared with the base metal, the corrosion products of HAZ have more surface cracks and larger outer voids, and the corrosive ions can reach the pipe surface more easily and accelerate the corrosion. In Lianmuqin soil simulated solution, X80 base material and HAZ corrosion products are Fe_2O_3,Fe SznFe1-x SfFe2OS _ 2s _ 3H _ 2O. In addition, O2SO4- and Cl~- in soil play a leading role in corrosion of pipes. The corrosion resistance of X80 base metal is better than that of HAZ steel. The corrosion mechanism of X80 steel accords with anodic dissolution.
【作者單位】: 西安石油大學材料科學與工程學院;
【基金】:國家自然科學基金資助項目(51271146) 陜西省自然科學基金資助項目(2016JQ5068) 陜西省重點學科專項資金資助項目(YS37020203) 陜西省能源化工過程強化重點實驗室資助項目(SXECPI201503)
【分類號】:TG172.4
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