本文關(guān)鍵詞： 海洋工程用鋼 陰極極化電位 慢應(yīng)變速率拉伸(SSRT) 氫脆　出處：《青島科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：E460、E500、E550和)XXX=等海洋工程用鋼在海洋環(huán)境中服役時(shí),會(huì)受到海水的腐蝕,因此對(duì)其施加陰極保護(hù)技術(shù),以減小海水對(duì)鋼結(jié)構(gòu)的腐蝕作用。由于高強(qiáng)鋼材料通常具有一定的氫脆敏感性,且隨材料強(qiáng)度的增大,氫脆敏感性增強(qiáng)。當(dāng)施加的陰極極化電位較負(fù)時(shí),會(huì)導(dǎo)致金屬材料表面析氫,氫擴(kuò)散進(jìn)入金屬組織內(nèi)部后,可能造成材料的氫脆斷裂。因此,選擇合理有效的陰極極化電位區(qū)間是對(duì)高強(qiáng)鋼進(jìn)行陰極保護(hù)設(shè)計(jì)時(shí)需要重點(diǎn)考慮的問題。本文采用電化學(xué)測試技術(shù)和慢應(yīng)變速率拉伸試驗(yàn)等方法,研究了E460、E500、E550和XXXX等材料在不同極化電位下的氫脆敏感性,探討了陰極極化電位對(duì)幾種高強(qiáng)鋼氫脆敏感性的影響規(guī)律。E460鋼在Ecorr～-0.85V極化電位電位區(qū)間,主要表現(xiàn)為韌性斷裂。在-0.85V～-0.95V電位區(qū)間內(nèi),斷口出現(xiàn)了準(zhǔn)解理組織的形貌特征。在-0.95V～-1.05V電位區(qū)間內(nèi),斷裂方式變?yōu)榱舜嘈詳嗔�。E500鋼在Ecorr～-0.85V電位區(qū)間,主要為陽極溶解型應(yīng)力腐蝕,其斷裂方式為韌性斷裂。在-0.85V～-0.90V電位區(qū)間內(nèi),斷口出現(xiàn)了準(zhǔn)解理組織的形貌特征。在-0.95V～-1.05V電位區(qū)間內(nèi),斷裂方式變?yōu)榱舜嘈詳嗔�。E550鋼在Ecorr～-0.90V的陰極極化電位區(qū)間,其斷裂方式主要表現(xiàn)為韌性斷裂。當(dāng)陰極極化電位負(fù)于-0.90V后,脆性斷裂傾向增大。當(dāng)電位進(jìn)一步負(fù)于-1.00V后,斷裂方式轉(zhuǎn)變?yōu)榇嘈詳嗔�。XXXX鋼在Ecorr～-0.90V的陰極極化電位區(qū)間,斷裂方式主要表現(xiàn)為韌性斷裂。當(dāng)陰極極化電位負(fù)于-0.90V后,有脆性斷裂傾向。當(dāng)電位進(jìn)一步負(fù)移到負(fù)于-0.95V后,斷裂方式轉(zhuǎn)變?yōu)榇嘈詳嗔�。XXXX鋼焊接件在Ecorr～-0.875V的陰極極化電位區(qū)間,斷裂方式主要表現(xiàn)為韌性斷裂。當(dāng)陰極極化電位負(fù)于-0.90V后,有脆性斷裂的傾向。當(dāng)陰極極化電位進(jìn)一步負(fù)于-0.95V后,斷裂方式轉(zhuǎn)變?yōu)榇嘈詳嗔选?br/>[Abstract]:Marine engineering steels such as E460, E500, E550 and XX = will be corroded by seawater when they are in service in the marine environment. Therefore, cathodic protection technology is applied to reduce corrosion of steel structures by seawater. High strength steel materials are usually sensitive to hydrogen embrittlement. The hydrogen embrittlement sensitivity increases with the increase of the material strength. When the applied cathodic polarization potential is negative, it will lead to hydrogen evolution on the surface of the metal material, and hydrogen diffusion into the metal structure may lead to the hydrogen embrittlement fracture of the material. The selection of a reasonable and effective cathodic polarization potential range is an important problem to be considered in the design of cathodic protection for high strength steel. In this paper, electrochemical measurement technique and slow strain rate tensile test are used. The hydrogen embrittlement sensitivity of E460 E500 E550 and XXXX at different polarization potentials was studied. The effect of cathodic polarization potential on the hydrogen embrittlement sensitivity of several high strength steels was discussed. In the range of -0.85 V ~ (-1) V ~ (-0.95) V potential, the morphology of quasi-cleavage structure appeared. In the range of -0.95 V ~ (-1) V ~ (-1.05V) potential, the fracture mode became brittle fracture. E500 steel changed into brittle fracture in Ecorr~-0.85V potential range, mainly anodic dissolved stress corrosion. The fracture mode is ductile fracture. In the range of -0.85 V ~ (-0.90) V potential, the fracture surface has the appearance of quasi-cleavage structure. In the range of -0.95 V ~ (-1.05V) potential, the fracture mode is changed into the cathodic polarization potential range of brittle fracture. E550 steel in Ecorr~-0.90V. When the cathodic polarization potential is negative at -0.90V, the brittle fracture tendency increases. When the potential is further negative at -1.00V, the fracture mode changes to the brittle fracture. XXXX steel changes to the cathodic polarization potential range of Ecorr~-0.90V. The fracture mode is mainly ductile fracture. When the cathodic polarization potential is negative to -0.90V, the fracture tends to brittle fracture. When the potential is further negative to -0.95V, the fracture mode changes into the brittle fracture. XXXX steel welds in the cathodic polarization potential range of Ecorr~-0.875V. The fracture mode is mainly ductile fracture. When the cathodic polarization potential is negative at -0.90V, the fracture tends to be brittle fracture, and when the cathodic polarization potential is further negative at -0.95V, the fracture mode changes to brittle fracture.
【學(xué)位授予單位】：青島科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TG174.41;TG142

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 徐敏杰;張華民;;斷電法測得的極化電位的研究[J];油田地面工程;1991年06期

2 張慧霞;戚霞;鄧春龍;王偉偉;;極化電位下高強(qiáng)鋼腐蝕疲勞裂紋擴(kuò)展的表征[J];腐蝕科學(xué)與防護(hù)技術(shù);2011年03期

3 黎清寧;蔣業(yè)華;盧德宏;周榮;;高錳鋼在不同極化電位下的沖擊腐蝕磨損行為[J];鑄造技術(shù);2008年04期

4 祁星;宋仁國;祁文娟;金驥戎;王超;李海;熊纓;;極化電位對(duì)7050鋁合金應(yīng)力腐蝕敏感性和膜致應(yīng)力的影響[J];航空材料學(xué)報(bào);2014年02期

5 張林;杜敏;劉吉飛;李妍;劉培林;;海水中極化電位對(duì)X70鋼氫脆敏感性的影響[J];材料科學(xué)與工藝;2011年05期

6 黃彥良，曹楚南，，呂明，林海潮;指數(shù)律衰減電流極化電位響應(yīng)的解析及其在測定金屬的瞬時(shí)腐蝕速度方面的應(yīng)用[J];腐蝕科學(xué)與防護(hù)技術(shù);1994年01期

7 黃子勛;李德林;翟金坤;;腐蝕縫隙內(nèi)電化學(xué)行為的初步理論探討——Ⅱ.模擬腐蝕縫隙內(nèi)電位、pH和Cl~-濃度的分布與極化電位及時(shí)間的關(guān)系[J];中國腐蝕與防護(hù)學(xué)報(bào);1986年03期

8 馮博學(xué);李明奇;;外加極化電位對(duì)08PVRe鋼在3.5％NaCl水溶液中疲勞裂紋擴(kuò)展速率的影響[J];物理測試;1990年03期

9 李德亮;劉晴;常志顯;張凌;張治軍;;恒電流庫侖分析法測定乙烯基三乙氧基硅烷[J];分析試驗(yàn)室;2009年08期

10 范宜仁,劉兵開,趙文杰;巖石激發(fā)極化電位的實(shí)驗(yàn)研究[J];測井技術(shù);1997年04期

相關(guān)博士學(xué)位論文 前1條

1 王偉男;激發(fā)極化電位衰減譜測井方法研究與儀器研制[D];中國地質(zhì)大學(xué)（北京）;2011年

相關(guān)碩士學(xué)位論文 前2條

1 陳祥曦;陰極極化對(duì)海洋工程用鋼及其焊縫氫脆敏感性影響的研究[D];青島科技大學(xué);2015年

2 晁一寒;巖石激發(fā)極化電位實(shí)驗(yàn)測試與分析[D];中國石油大學(xué);2011年

本文編號(hào)：1520233