本文選題：耐候鋼　切入點(diǎn)：海岸大氣　出處：《沈陽理工大學(xué)》2015年碩士論文

【摘要】：耐候鋼暴露在大氣中,其表面能夠生成與基體結(jié)合性良好的保護(hù)性銹層,從而無需進(jìn)行表面防護(hù)處理即可以在一些環(huán)境中直接使用。但是在自然環(huán)境下裸露使用時(shí),在形成穩(wěn)定銹層之前鋼表面會(huì)發(fā)生銹液流掛、飛散等現(xiàn)象,造成了環(huán)境污染等問題,制約了其發(fā)展。為了解決這個(gè)問題,20世紀(jì)60年代初,日本首先開發(fā)了耐候鋼表面銹層穩(wěn)定化處理技術(shù),實(shí)施該技術(shù)能夠促進(jìn)銹層由γ-Fe OOH向α-Fe OOH轉(zhuǎn)變,縮短穩(wěn)定銹層形成的時(shí)間。目前國內(nèi)技術(shù)還不成熟,因此研究開發(fā)出成本較低,且應(yīng)用范圍較廣的耐候鋼表面銹層穩(wěn)定化處理技術(shù),具有顯著的經(jīng)濟(jì)效益和工程價(jià)值。耐候鋼表面銹層穩(wěn)定化處理技術(shù)研究的主要內(nèi)容包括能夠促進(jìn)耐候鋼表面盡快形成均勻致密的穩(wěn)定化銹層的物質(zhì)(我們稱之為穩(wěn)定劑)的選取,以及耐候鋼表面穩(wěn)定化處理時(shí)采用的有機(jī)涂膜材料的選取。本文以低成本、全候型Mn Cu P耐候鋼對(duì)研究對(duì)象,主要在穩(wěn)定劑的選取方面進(jìn)行了初探,即:本文采用實(shí)驗(yàn)室模擬大氣腐蝕干/濕交替實(shí)驗(yàn)、X-射線衍射、動(dòng)電位極化曲線、電化學(xué)阻抗譜等方法研究了海岸大氣環(huán)境中Cr2(SO4)3和Na NO2濃度對(duì)Mn Cu P耐候鋼表面銹層穩(wěn)定化過程的影響。主要工作包括以下幾個(gè)方面:研究了模擬海岸大氣中Cr2(SO4)3的添加對(duì)Mn Cu P耐候鋼腐蝕行為的影響。通過60次干/濕交替大氣腐蝕實(shí)驗(yàn)發(fā)現(xiàn),海岸大氣模擬液中Cr2(SO4)3的添加可以明顯降低Mn Cu P鋼的腐蝕速率,加速表面銹層的穩(wěn)定化。但是,Cr2(SO4)3的添加對(duì)Mn Cu P鋼腐蝕行為的影響存在濃度極值現(xiàn)象。在本研究的實(shí)驗(yàn)條件下,當(dāng)模擬液中Cr2(SO4)3濃度為0.02mass%時(shí),Mn Cu P鋼的腐蝕增重最小且優(yōu)先進(jìn)入穩(wěn)定化狀態(tài)。研究了模擬海岸大氣中Na NO2的添加對(duì)Mn Cu P耐候鋼腐蝕行為的影響。通過60次干/濕交替大氣腐蝕實(shí)驗(yàn)發(fā)現(xiàn),海岸大氣模擬液中Na NO2的添加可以明顯降低Mn Cu P鋼的腐蝕速率,加速表面銹層的穩(wěn)定化。但是,較高濃度的Na NO2使得Mn Cu P鋼的腐蝕速率太小,不利于鋼表面盡快形成保護(hù)性銹層。在本研究的實(shí)驗(yàn)條件下,當(dāng)模擬液中Na NO2濃度為0.005 mass%時(shí),Mn Cu P鋼的腐蝕增重最小且優(yōu)先進(jìn)入穩(wěn)定化狀態(tài)。在所有模擬環(huán)境中,Mn Cu P鋼表面銹層均由α-Fe OOH,β-Fe OOH,γ-Fe OOH和Fe3O4組成;模擬液中少量Cr2(SO4)3的存在抑制了β-Fe OOH的形成,促進(jìn)了Fe3O4的形成,但是,較多含量Cr2(SO4)3的存在又抑制了β-Fe OOH向Fe3O4的還原;模擬液中少量Na NO2的存在促進(jìn)了Fe3O4的形成,但是由于高濃度Na NO2時(shí)形成的銹層較為疏松,使得銹層中Fe3O4含量逐漸減少。
[Abstract]:When weathering steel is exposed to the atmosphere, its surface can form a protective rust layer with good bonding with the matrix, so that it can be used directly in some environments without surface protection. Before the stable rust layer is formed, the surface of the steel will have the phenomenon of liquid rust hanging and dispersing, which will lead to environmental pollution and restrict its development. In order to solve this problem in the early 1960s, Japan first developed the stabilization treatment technology of rust layer on weathering steel surface, which can promote the transformation of rust layer from 緯 -Fe OOH to 偽 -Fe OOH, and shorten the forming time of stable rust layer. At present, the domestic technology is not mature, so the cost of research and development is relatively low. And it is widely used to stabilize the rust layer on the surface of weathering steel. It has remarkable economic benefit and engineering value. The main contents of the research on the stabilization technology of rust layer on weathering steel surface include materials which can promote the formation of homogeneous and dense stable rust layer on weathering steel surface as soon as possible (we call it. The selection of stabilizers, And the selection of organic coating materials used in surface stabilization treatment of weathering steel. In this paper, the selection of stabilizer for low cost, all-weather type mn Cu P weathering steel was studied. In this paper, X- ray diffraction and potentiodynamic polarization curves are used to simulate the dry / wet alternating experiments of atmospheric corrosion. The effects of concentrations of Cr2(SO4)3 and Na NO2 in coastal atmospheric environment on the stabilization of rust layer on the surface of mn Cu P weathering steel were studied by electrochemical impedance spectroscopy. The main work includes the following aspects: the simulation of Cr2(SO4)3 in coastal atmosphere has been studied. Effect of addition on corrosion behavior of mn Cu P weathering steel. The addition of Cr2(SO4)3 in coastal atmosphere simulated solution can obviously reduce the corrosion rate of mn Cu P steel and accelerate the stabilization of rust layer on the surface. However, the effect of Cr 2 so 4 so 4 + 3 on the corrosion behavior of mn Cu P steel has the phenomenon of concentration extremum. When the concentration of Cr2(SO4)3 in the simulated solution is 0.02 mass%, the corrosion weight of mn Cu P steel is the least and the steel is in a stable state. The effect of Na NO2 addition in simulated coastal atmosphere on the corrosion behavior of mn Cu P weathering steel is studied. The corrosion behavior of mn Cu P weathering steel is studied by 60 dry / wet tests. Alternating atmospheric corrosion experiments show that, The addition of Na NO2 in coastal atmospheric simulated solution can obviously reduce the corrosion rate of mn Cu P steel and accelerate the stabilization of surface rust layer. However, the higher Na NO2 concentration makes the corrosion rate of mn Cu P steel too small. It is not conducive to the formation of protective rust layer on steel surface as soon as possible. When the concentration of Na NO2 in the simulated solution is 0.005, the corrosion weight of Mn-Cu P steel is minimum and the corrosion becomes stable. In all simulated environments, the rust layer on the surface of Mn-Cu P steel is composed of 偽 -Fe OHH, 尾 -Fe OOH, 緯 -Fe OOH and Fe3O4. The presence of a small amount of Cr2(SO4)3 in the simulated solution inhibited the formation of 尾 -Fe OOH and promoted the formation of Fe3O4. However, the presence of more Cr2(SO4)3 inhibited the reduction of 尾 -Fe OOH to Fe3O4, and the presence of a small amount of Na NO2 promoted the formation of Fe3O4. However, the rusty layer formed at high concentration of Na NO2 was looser, and the content of Fe3O4 in rust layer decreased gradually.
【學(xué)位授予單位】：沈陽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TG174.4

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