【摘要】：通過室內(nèi)模擬試驗，研究8種不同類型無機化合物污染土和有機化合物污染土在4種不同致污物質(zhì)含量下其電阻率的變異性分布規(guī)律；同時通過室內(nèi)埋設(shè)與研究Q235鋼試樣在5個不同腐蝕時間下的腐蝕形貌、腐蝕失重率、腐蝕動力方程、腐蝕速率和腐蝕速率影響因子等腐蝕參數(shù)分布規(guī)律；最后根據(jù)pH值、電阻率和腐蝕失重測試結(jié)果進行對比分析，，綜合分析了電阻率評價Q235鋼腐蝕性等級的可靠性。 （1）通過測試50Hz～1000000Hz共9個不同頻率各種污染土電阻率平均值的變異分布規(guī)律，得出：隨著頻率的增大，各種污染土的電阻率平均值與頻率呈對數(shù)函數(shù)降低趨勢，其相關(guān)系數(shù)在0.73～0.99之間，污染土電阻率與頻率相關(guān)性顯著。 （2）分析了固定頻率50Hz下污染土的電阻率分布規(guī)律，得出：硫酸污染土與汽油污染土的電阻率隨著污染介質(zhì)含量的增大呈增大趨勢，其他污染土電阻率隨著污染介質(zhì)含量的增大呈減小趨勢；污染土的電阻率與污染介質(zhì)的含量變化關(guān)系比較顯著；同時得到了污染土電阻率與污染土飽和度的相關(guān)關(guān)系式。 （3）對頻率為50Hz下8類污染介質(zhì)33種污染土的電阻率平均值進行由小到大排序分布，得出汽油污染土的P2、P3、P4和硫酸污染土SH4電阻率較未污染土（W）的電阻率要大；其他污染土的電阻率較未污染土（W）的電阻率要小，其中氯化鈉污染土NC4、氯化鎂污染土MC4、硫酸鈉污染土NS4和氫氧化鈉污染土NO4四種污染土的電阻率最小。 （4）得到了Q235鋼在不同類型污染土不同腐蝕時間下腐蝕宏觀形貌并計算了Q235鋼的腐蝕失重率、腐蝕動力方程、腐蝕速率和腐蝕速率影響因子。根據(jù)失重測試結(jié)果得到了Q235鋼的平均腐蝕失重率和腐蝕速率排序分布；得到了不同腐蝕時間下污染土腐蝕速率影響因子平均值排序規(guī)律，得出：硫酸鎂（MS）、氯化鎂（MC）和硫酸（HS）三種污染介質(zhì)的污染土排在后三位，分別為：1.95、2.20和2.42，氫氧化鈉（NO）、硫酸鈉（NS）和洗衣粉（TD）三種污染介質(zhì)排在前三位，分別為3.59、6.43和7.82。 （5）結(jié)合電阻率、pH值、224天腐蝕速率和不同時間下的腐蝕速率平均值排序，綜合評價污染土的腐蝕性等級得出：硫酸污染土（HS）、氫氧化鈉污染土（NO）和汽油污染土（P）中Q235鋼的腐蝕主要由pH值或有機物控制，由電阻率判別腐蝕性等級會誤判；氯化鎂污染土（MC）和氯化鈉污染土（NC）中Q235鋼的腐蝕由電阻率判別腐蝕性等級會高判或重判；硫酸鈉污染土（NS）和洗衣粉污染土（TD）中Q235鋼的腐蝕性根據(jù)電阻率評判會低判或輕判；而硫酸鎂污染土（MS）中Q235鋼的腐蝕性等級根據(jù)電阻率評判相對準確。 本文研究可為國家或行業(yè)標準的制定或修訂，與為在污染土中相關(guān)工程建設(shè)項目的設(shè)計選材與防護技術(shù)提供重要的基礎(chǔ)數(shù)據(jù)和科學依據(jù)，有重大的經(jīng)濟和社會效益。
[Abstract]:The variability distribution of resistivity of 8 kinds of inorganic compound contaminated soil and organic compound contaminated soil under four different content of pollutants were studied by laboratory simulation test. At the same time, the distribution of corrosion parameters such as corrosion morphology, corrosion weight loss rate, corrosion dynamic equation, corrosion rate and influence factors of corrosion rate of Q235 steel samples under 5 different corrosion time were studied by embedding and studying in laboratory. Finally, according to the pH value, resistivity and corrosion weight loss test results, the reliability of resistivity evaluation of corrosion grade of Q235 steel is comprehensively analyzed. The main results are as follows: (1) by testing the variation distribution law of resistivity average value of 9 kinds of polluted soils at different frequencies of 50Hz~1000000Hz, it is concluded that with the increase of frequency, the average and frequency of resistivity of various polluted soils decrease by logarithmic function. The correlation coefficient is between 0.73 and 0.99, and the resistivity of contaminated soil is significantly correlated with frequency. (2) the resistivity distribution of contaminated soil under fixed frequency 50Hz is analyzed. It is concluded that the resistivity of sulfuric acid contaminated soil and gasoline contaminated soil increases with the increase of polluted medium content. The resistivity of other contaminated soils decreased with the increase of the content of contaminated medium. The relationship between the resistivity of contaminated soil and the content of contaminated medium is significant, and the correlation between the resistivity of contaminated soil and saturation of contaminated soil is obtained. (3) the average resistivity of 33 kinds of polluted soils with 50Hz frequency is arranged from small to large. The results show that the resistivity of gasoline contaminated soil and sulfuric acid contaminated soil SH4 is higher than that of unpolluted soil (W). The resistivity of other contaminated soils is smaller than that of unpolluted soils, and the resistivity of NC4, contaminated soil, magnesium chloride contaminated soil, MC4, sulfate contaminated soil, NS4, and sodium hydroxide contaminated soil, NO4, is the lowest. (4) the corrosion macroscopic morphology of Q235 steel under different corrosion time was obtained, and the corrosion weight loss rate, corrosion dynamic equation, corrosion rate and corrosion rate influence factors of Q235 steel were calculated. According to the results of weightlessness test, the average corrosion weight loss rate and the order distribution of corrosion rate of Q235 steel were obtained. The order law of the average value of the factors affecting the corrosion rate of contaminated soil at different corrosion time was obtained. It was concluded that the contaminated soil of magnesium sulfate (MS), magnesium chloride (MC) and (HS) sulphate was in the last three places. Sodium hydroxide (NO),) sodium sulfate (NS) and washing powder (TD) were the first three pollutants, which were 3.59% 6.43 and 7.82 respectively. (5) according to the order of resistivity, pH value, 224 day corrosion rate and the average corrosion rate of different time, the corrosion grade of contaminated soil is evaluated synthetically. The (HS), of sulfuric acid contaminated soil is obtained. The corrosion of Q235 steel in sodium hydroxide contaminated soil (NO) and gasoline contaminated soil (P) is mainly controlled by pH value or organic matter. The corrosion of Q235 steel in magnesium chloride contaminated soil (MC) and sodium chloride contaminated soil (NC) is higher or heavier if the corrosion grade of Q235 steel is judged by resistivity. The corrosivity of Q235 steel in sodium sulfate contaminated soil (NS) and washing powder contaminated soil (TD) is lower or lighter according to resistivity evaluation, while the corrosion grade of Q235 steel in magnesium sulfate contaminated soil (MS) is relatively accurate according to resistivity evaluation. The research in this paper can provide important basic data and scientific basis for the formulation or revision of national or industry standards, and for the design, selection and protection technology of related engineering construction projects in contaminated soil, which has great economic and social benefits.
【學位授予單位】：太原理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU411;X53

【參考文獻】

相關(guān)期刊論文 前10條

1 杜翠薇,李曉剛,武俊偉,宋義全,徐t

本文編號：2414974