電弧噴涂Zn、Al、ZnAl涂層在模擬深海環(huán)境下的腐蝕行為研究
發(fā)布時間：2019-03-15 12:30
【摘要】：隨著我國海洋石油工業(yè)“深水戰(zhàn)略”的實施,開發(fā)海底資源需要制造和使用新型儀器和設(shè)備。然而,深海具有非常獨特的腐蝕環(huán)境,海水腐蝕性較強。熱噴涂Zn、Al及其合金涂層技術(shù)相較于有機涂層,能夠使鋼鐵結(jié)構(gòu)的防腐性能得到進一步提高,其中,電弧噴涂作為熱噴涂技術(shù)之一,在腐蝕防護領(lǐng)域已經(jīng)得到了成功的運用。目前國內(nèi)對于電弧噴涂犧牲陽極涂層在深海環(huán)境中腐蝕性能、規(guī)律和影響因素迄今報道較少,尚缺少系統(tǒng)研究。同時,深海環(huán)境的研究大多涉及軍事領(lǐng)域,國外為數(shù)不多的研究也是資料保密,極少公開。本文以電弧噴涂Zn涂層、Al涂層、ZnAl合金涂層為研究對象,采用金相顯微鏡、體視顯微鏡、X射線衍射技術(shù)、室內(nèi)腐蝕掛片與電化學(xué)測試相結(jié)合的方法,研究并對比分析了涂層在模擬淺海及深海海水中的腐蝕形貌、腐蝕產(chǎn)物及腐蝕電化學(xué)性能隨時間的變化規(guī)律,從而獲得涂層在模擬深海環(huán)境下的腐蝕機理。對涂層進行宏觀形貌觀察及截面微觀形貌的金相分析的結(jié)果表明,Zn涂層平均孔隙率為2.67%左右;Al涂層平均孔隙率為7.2%左右;ZnAl涂層平均孔隙率約為4.03%,介于Zn涂層和Al涂層孔隙率之間。三種涂層總體來說符合熱噴涂涂層的質(zhì)量標準。對涂層在模擬海水環(huán)境下的腐蝕形貌及腐蝕產(chǎn)物(XRD)進行分析,在模擬深海腐蝕環(huán)境下,涂層表面腐蝕產(chǎn)物相對較少,不能完全覆蓋表面,涂層在海水環(huán)境下呈現(xiàn)出均勻腐蝕的腐蝕形貌。三種涂層腐蝕過程為吸氧腐蝕。Zn涂層表面為點狀腐蝕產(chǎn)物Zn5(OH)8Cl2·H2O,質(zhì)地疏松;鋁涂層腐蝕產(chǎn)物為絮狀A(yù)l(OH)3,不易溶解于海水中;鋅鋁涂層腐蝕產(chǎn)物主要為Zn5(OH)8Cl2·H2O及Zn0.7Al0.3(OH)2(CO3)0.15·x H2O(Zn和Al的復(fù)合化合物)。而在模擬淺海腐蝕環(huán)境下,涂層表面完全被白色腐蝕產(chǎn)物覆蓋,腐蝕產(chǎn)物較多。對涂層在模擬深海中的自腐蝕電位曲線及動電位極化曲線進行研究發(fā)現(xiàn),三種涂層自腐蝕電位始終低于Q235的電位,能夠為基體提供有效保護。鋅鋁涂層在海水中自腐蝕電位及動電位極化曲線與電弧噴涂鋅涂層的曲線十分接近。對涂層在模擬深海及淺海環(huán)境下的腐蝕電化學(xué)行為進行對比,同時結(jié)合腐蝕形貌及腐蝕產(chǎn)物分析,了解到涂層在模擬深海環(huán)境的腐蝕機理�？傮w來說,在模擬深海環(huán)境下,溫度較低,電化學(xué)腐蝕阻力較大,腐蝕速率明顯低于模擬淺海環(huán)境下的腐蝕速率;含氧量較少,腐蝕產(chǎn)物較少,對涂層孔隙具有微弱的封閉作用,腐蝕速率在浸泡過程中略有降低。
[Abstract]:With the implementation of deepwater strategy in China's offshore petroleum industry, the development of submarine resources requires the manufacture and use of new instruments and equipment. However, the deep sea has a very unique corrosive environment, and the seawater is more corrosive. Compared with organic coating, thermal spraying Zn,Al and its alloy coating technology can further improve the corrosion resistance of steel structure. As one of the thermal spraying techniques, arc spraying has been successfully used in corrosion protection field. At present, the corrosion behavior, regularity and influencing factors of arc spraying sacrificial anode coating in deep sea environment are less reported, and there is still no systematic research on the corrosion performance of arc spraying sacrificial anode coating in deep sea environment. At the same time, the deep sea environment research mostly involves the military field, the few foreign research is also confidential, rarely public. In this paper, arc sprayed Zn coating, Al coating and ZnAl alloy coating were used as research objects. Metallographic microscope, stereoscopic microscope, X-ray diffraction technique, indoor corrosion coating and electrochemical test were used. The corrosion morphology, corrosion products and corrosion electrochemical properties of the coatings in simulated shallow sea and deep sea water were studied and compared with each other. The corrosion mechanism of the coatings in simulated deep sea environment was obtained. The results of macro-morphology observation and metallographic analysis show that the average porosity of Zn coating is about 2.67%, the average porosity of Al coating is about 7.2%, and the average porosity of the coating is about 2.67%, and the average porosity of the coating is about 7.2%. The average porosity of ZnAl coating is about 4.03%, which is between Zn coating and Al coating. The three coatings generally meet the quality standards of thermal spraying coatings. The corrosion morphology and corrosion product (XRD) of the coating in simulated seawater environment were analyzed. Under the simulated deep sea corrosion environment, the corrosion products on the coating surface were relatively few, and the coating surface could not completely cover the surface. The coating exhibits uniform corrosion morphology in seawater environment. The corrosion process of the three coatings is oxygen absorption corrosion. The surface of Zn coating is a spot corrosion product Zn5 (OH) 8Cl2 路H2O, which is loose in texture, while the corrosion product of aluminum coating is flocculant Al (OH) 3, which is not easy to dissolve in seawater. The corrosion products of Zn-Al coating are mainly Zn5 (OH) 8Cl2 路H 2O and Zn0.7Al0.3 (OH) 2 (CO3) 0.15 路x H 2O (compound of Zn and Al). But in the simulated shallow sea corrosion environment, the coating surface is completely covered by white corrosion products, corrosion products are more. The self-corrosion potential curves and potentiodynamic polarization curves of the coatings in simulated deep sea were studied. It was found that the self-corrosion potentials of the three coatings were always lower than those of Q235, which could provide effective protection for the substrate. The curves of self-corrosion potential and potentiodynamic polarization of Zn-Al coating in seawater are very close to those of arc sprayed zinc coating. The corrosion electrochemical behavior of the coating in simulated deep sea and shallow sea environment was compared. Combined with the corrosion morphology and corrosion product analysis, the corrosion mechanism of the coating in simulated deep sea environment was found out. Generally speaking, in the simulated deep sea environment, the temperature is lower, the electrochemical corrosion resistance is larger, and the corrosion rate is obviously lower than the simulated shallow sea environment. Less oxygen content and less corrosion products have a weak sealing effect on the pores of the coating, and the corrosion rate decreases slightly in the process of immersion.
【學(xué)位授予單位】：中國石油大學(xué)(華東)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG174.4
本文編號：2440626
[Abstract]:With the implementation of deepwater strategy in China's offshore petroleum industry, the development of submarine resources requires the manufacture and use of new instruments and equipment. However, the deep sea has a very unique corrosive environment, and the seawater is more corrosive. Compared with organic coating, thermal spraying Zn,Al and its alloy coating technology can further improve the corrosion resistance of steel structure. As one of the thermal spraying techniques, arc spraying has been successfully used in corrosion protection field. At present, the corrosion behavior, regularity and influencing factors of arc spraying sacrificial anode coating in deep sea environment are less reported, and there is still no systematic research on the corrosion performance of arc spraying sacrificial anode coating in deep sea environment. At the same time, the deep sea environment research mostly involves the military field, the few foreign research is also confidential, rarely public. In this paper, arc sprayed Zn coating, Al coating and ZnAl alloy coating were used as research objects. Metallographic microscope, stereoscopic microscope, X-ray diffraction technique, indoor corrosion coating and electrochemical test were used. The corrosion morphology, corrosion products and corrosion electrochemical properties of the coatings in simulated shallow sea and deep sea water were studied and compared with each other. The corrosion mechanism of the coatings in simulated deep sea environment was obtained. The results of macro-morphology observation and metallographic analysis show that the average porosity of Zn coating is about 2.67%, the average porosity of Al coating is about 7.2%, and the average porosity of the coating is about 2.67%, and the average porosity of the coating is about 7.2%. The average porosity of ZnAl coating is about 4.03%, which is between Zn coating and Al coating. The three coatings generally meet the quality standards of thermal spraying coatings. The corrosion morphology and corrosion product (XRD) of the coating in simulated seawater environment were analyzed. Under the simulated deep sea corrosion environment, the corrosion products on the coating surface were relatively few, and the coating surface could not completely cover the surface. The coating exhibits uniform corrosion morphology in seawater environment. The corrosion process of the three coatings is oxygen absorption corrosion. The surface of Zn coating is a spot corrosion product Zn5 (OH) 8Cl2 路H2O, which is loose in texture, while the corrosion product of aluminum coating is flocculant Al (OH) 3, which is not easy to dissolve in seawater. The corrosion products of Zn-Al coating are mainly Zn5 (OH) 8Cl2 路H 2O and Zn0.7Al0.3 (OH) 2 (CO3) 0.15 路x H 2O (compound of Zn and Al). But in the simulated shallow sea corrosion environment, the coating surface is completely covered by white corrosion products, corrosion products are more. The self-corrosion potential curves and potentiodynamic polarization curves of the coatings in simulated deep sea were studied. It was found that the self-corrosion potentials of the three coatings were always lower than those of Q235, which could provide effective protection for the substrate. The curves of self-corrosion potential and potentiodynamic polarization of Zn-Al coating in seawater are very close to those of arc sprayed zinc coating. The corrosion electrochemical behavior of the coating in simulated deep sea and shallow sea environment was compared. Combined with the corrosion morphology and corrosion product analysis, the corrosion mechanism of the coating in simulated deep sea environment was found out. Generally speaking, in the simulated deep sea environment, the temperature is lower, the electrochemical corrosion resistance is larger, and the corrosion rate is obviously lower than the simulated shallow sea environment. Less oxygen content and less corrosion products have a weak sealing effect on the pores of the coating, and the corrosion rate decreases slightly in the process of immersion.
【學(xué)位授予單位】：中國石油大學(xué)(華東)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG174.4
【參考文獻】
相關(guān)期刊論文 前10條
1 劉雅馨;錢基;熊利平;郭寶申;丁建可;熊偉;張淑霞;;我國深水油氣開發(fā)的必要性與可行性分析[J];中國礦業(yè);2013年03期
2 趙增元;呂偉艷;劉存;馬永青;孔愛民;;陰極保護和有機涂層聯(lián)合防腐在深海石油設(shè)施中的應(yīng)用研究[J];全面腐蝕控制;2012年09期
3 童輝;魏世丞;陳永雄;劉玉欣;劉毅;徐濱士;;鋼質(zhì)潛水器表面防護的研究和發(fā)展現(xiàn)狀[J];中國表面工程;2012年05期
4 樓淼;蘆玉峰;劉振興;范成洲;胡新東;胡永樂;秋實;;電弧噴涂工藝參數(shù)對Zn-Al合金涂層性能的影響[J];金屬熱處理;2011年09期
5 張舞文;馬愛斌;江靜華;盧富敏;宋丹;;海洋工程用鋼表面噴涂Zn、Al和Zn-55%Al偽合金涂層的耐蝕性[J];中國表面工程;2011年03期
6 劉斌;;深海環(huán)境下防腐蝕涂料性能評價技術(shù)研究[J];上海涂料;2011年05期
7 劉杰;李相波;王佳;;在模擬深海高壓環(huán)境中人工破損涂層的電化學(xué)阻抗譜響應(yīng)特征[J];腐蝕科學(xué)與防護技術(shù);2010年04期
8 周建龍;李曉剛;程學(xué)群;董超芳;杜翠薇;盧琳;;深海環(huán)境下金屬及合金材料腐蝕研究進展[J];腐蝕科學(xué)與防護技術(shù);2010年01期
9 劉斌;叢園;張濤;邵亞薇;孟國哲;王福會;;深海環(huán)境下靜水壓力對純鎳腐蝕行為的影響[J];腐蝕科學(xué)與防護技術(shù);2009年01期
10 孔愛民;;淺析深水油氣平臺的腐蝕和材料選擇[J];中國海洋平臺;2008年06期
相關(guān)碩士學(xué)位論文 前3條
1 王凱;冷噴涂鋁及鋁鋅涂層海洋大氣腐蝕行為研究[D];山東大學(xué);2011年
2 郭麗娟;Zn/Al犧牲陽極涂層模擬低溫海洋環(huán)境的腐蝕行為研究[D];中國石油大學(xué);2011年
3 李春玲;Zn-Al偽合金涂層的制備及耐海洋腐蝕性能研究[D];中國石油大學(xué);2010年
，本文編號：2440626
本文鏈接：http://sikaile.net/kejilunwen/jinshugongy/2440626.html
最近更新
教材專著
