【摘要】：通過(guò)室內(nèi)模擬試驗(yàn)，統(tǒng)計(jì)分析了汽油和洗衣粉污染土的物理、力學(xué)和電化學(xué)性質(zhì)；研究了Q235鋼的宏觀、微觀腐蝕形貌和腐蝕速率的變化規(guī)律；由灰關(guān)聯(lián)法建立起腐蝕速率與污染土腐蝕參數(shù)的多元線性回歸方程，為實(shí)際工程中鋼材的腐蝕防護(hù)提供參考。 （1）經(jīng)過(guò)統(tǒng)計(jì)研究汽油和洗衣粉污染土的物理、力學(xué)和電化學(xué)性質(zhì)，得出：土的可塑性指標(biāo)（液限、塑限和塑性指數(shù)）隨汽油含量的增加而減小，隨洗衣粉含量的增加而增大；密度、飽和度和電阻率隨汽油含量的增加而增大，隨洗衣粉含量的增加而減�。粔嚎s系數(shù)隨著壓力的增大而減小，壓縮模量隨著壓力的增大而增大，隨污染物含量增加的變化規(guī)律不明顯；氧化還原電位隨污染物含量的增加而減小。 （2）經(jīng)過(guò)對(duì)比分析汽油和洗衣粉對(duì)土的基本參數(shù)的影響程度，得出：汽油對(duì)密度和腐蝕電位的影響比洗衣粉大；洗衣粉對(duì)土的含水量、飽和度、電阻率和氧化還原電位的影響比汽油大；綜合來(lái)看，相同含量下的洗衣粉污染土比汽油污染土對(duì)鋼的腐蝕性強(qiáng)。 （3）經(jīng)過(guò)對(duì)比觀察Q235鋼在汽油和洗衣粉污染土中的宏觀和微觀腐蝕形貌，得出：腐蝕強(qiáng)度隨腐蝕時(shí)間的增加而加大，隨汽油含量的增加而加大，隨洗衣粉含量的增加而先加大后減�。桓g初期為不均勻腐蝕，腐蝕后期為均勻腐蝕，腐蝕產(chǎn)物逐漸增多，腐蝕坑逐漸加深，，腐蝕越來(lái)越嚴(yán)重；Q235鋼在洗衣粉污染土中的腐蝕坑比在汽油污染土中的大或深，甚至形成了穿透性的孔洞。 （4）Q235鋼的腐蝕速率隨汽油含量和腐蝕時(shí)間的增加而增大，隨洗衣粉含量的增加而先加大后減小。由灰關(guān)聯(lián)法確定了汽油污染土的腐蝕參數(shù)對(duì)腐蝕速率的影響順序（電阻率、氧化還原電位和汽油含量三個(gè)參數(shù)對(duì)Q235鋼的腐蝕起主導(dǎo)作用）及洗衣粉污染土的腐蝕參數(shù)對(duì)腐蝕速率的影響順序（密度、腐蝕電位和氧化還原電位三個(gè)參數(shù)對(duì)Q235鋼的腐蝕起主導(dǎo)作用），并建立了腐蝕速率與主要腐蝕參數(shù)的多元線性回歸方程，可用于預(yù)測(cè)Q235鋼在污染土中的腐蝕速率。
[Abstract]:The physical, mechanical and electrochemical properties of gasoline and detergent contaminated soil were statistically analyzed through laboratory simulation tests, and the changes of macroscopic and microscopic corrosion morphology and corrosion rate of Q235 steel were studied. The multivariate linear regression equation between corrosion rate and corrosion parameters of contaminated soil is established by grey correlation method, which provides a reference for the corrosion protection of steel in practical engineering. The main results are as follows: (1) the physical, mechanical and electrochemical properties of gasoline and detergent contaminated soil are studied statistically. It is concluded that the plasticity index (liquid limit, plastic limit and plastic index) of the soil decreases with the increase of gasoline content. The content of detergent increased with the increase of detergent content. The density, saturation and resistivity increase with the increase of gasoline content, and decrease with the increase of detergent content. The compression coefficient decreases with the increase of the pressure, the modulus of compression increases with the increase of the pressure, and the variation law with the increase of the pollutant content is not obvious, while the redox potential decreases with the increase of the pollutant content. (2) by comparing and analyzing the influence of gasoline and washing powder on the basic parameters of soil, it is concluded that the influence of gasoline on density and corrosion potential is greater than that on washing powder; The effect of washing powder on soil moisture saturation resistivity and redox potential is greater than that of gasoline. (3) by comparing and observing the macroscopic and microscopic corrosion morphology of Q235 steel in gasoline and detergent contaminated soil, it is concluded that the corrosion strength increases with the increase of corrosion time and increases with the increase of gasoline content. With the increase of washing powder content, it first increases and then decreases. At the beginning of corrosion, the corrosion is uneven, and the corrosion is uniform in the later stage. The corrosion products increase gradually, the corrosion pit deepens gradually, and the corrosion becomes more and more serious. The corrosion pits of Q235 steel in detergent contaminated soil are larger or deeper than those in gasoline contaminated soil, and even form penetrating holes. (4) the corrosion rate of Q235 steel increases with the increase of gasoline content and corrosion time, and then decreases with the increase of washing powder content. The influence order of corrosion parameters of gasoline contaminated soil on corrosion rate (resistivity, resistivity) was determined by grey correlation method. Three parameters, redox potential and gasoline content, play a leading role in the corrosion of Q235 steel. Corrosion potential and redox potential play a dominant role in the corrosion of Q235 steel. The multivariate linear regression equation between corrosion rate and main corrosion parameters is established, which can be used to predict the corrosion rate of Q235 steel in contaminated soil.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU411

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