本文關(guān)鍵詞： 高錳鋼 納米晶 模擬海水 NaOH溶液 KHSO4溶液 NaCl溶液　出處：《燕山大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：本文以原態(tài)高錳鋼、變形高錳鋼和納米晶高錳鋼為研究對象,利用金相和TEM分析方法測定試樣的組織結(jié)構(gòu),利用極化曲線、電化學(xué)阻抗譜分析方法研究不同狀態(tài)高錳鋼在不同腐蝕介質(zhì)環(huán)境中的腐蝕行為,并采用掃描電子顯微鏡對腐蝕后的試樣表面形貌進(jìn)行對比觀察。腐蝕介質(zhì)主要有:模擬海水、p H為4的弱酸性KHSO4溶液、p H為10的弱堿性Na OH溶液、加入不同濃度KHSO4的3.5%Na Cl溶液、加入不同濃度Na OH的3.5%Na Cl溶液。研究結(jié)果表明:在模擬海水、p H為4的弱酸性KHSO4溶液中,氯離子和硫酸根離子為破壞性離子,會加速高錳鋼的腐蝕。在p H為10的弱堿性Na OH溶液中,OH-能促進(jìn)高錳鋼表面耐腐蝕產(chǎn)物的形成,從而抑制高錳鋼的腐蝕。三種高錳鋼試樣在加入不同濃度KHSO4的3.5%Na Cl溶液中,硫酸氫根離子與氯離子在高錳鋼表面會發(fā)生競爭吸附,當(dāng)硫酸氫根離子濃度很低時(shí),硫酸氫根離子會對腐蝕起到一定的抑制作用,隨著硫酸氫根離子濃度的增大,吸附在高錳鋼表面的硫酸氫根離子數(shù)目增多,從而加速高錳鋼的腐蝕,使高錳鋼的耐蝕性下降。三種高錳鋼試樣在加入不同濃度Na OH的3.5%Na Cl溶液中,隨著加入的Na OH溶液濃度的增大,高錳鋼的耐蝕性逐漸提高,證明OH-可以抑制Cl-對高錳鋼的腐蝕。納米晶高錳鋼在含Cl-和OH-腐蝕介質(zhì)中的耐蝕性明顯優(yōu)于原態(tài)高錳鋼和變形高錳鋼,表明具有納米晶組織的鋼鐵材料具有優(yōu)異抗腐蝕能力。
[Abstract]:In this paper, the microstructure of high manganese steel, deformed high manganese steel and nanocrystalline high manganese steel were measured by metallography and TEM, and polarization curves were used. Electrochemical impedance spectroscopy (EIS) was used to study the corrosion behavior of high manganese steel in different corrosion medium. The surface morphology of the samples after corrosion was observed by scanning electron microscope. The corrosion media were as follows: weak acidic KHSO4 solution with simulated seawater pH = 4, weak alkaline NaOH solution with pH = 10 and 3.5% NaCl solution with different concentrations of KHSO4. The results show that chloride and sulfate ions are destructive ions in weak acid KHSO4 solution with simulated seawater pH = 4. It can accelerate the corrosion of high manganese steel. In weak alkaline NaOH solution with pH = 10, OH- can promote the formation of corrosion resistant products on the surface of high manganese steel and thus inhibit the corrosion of high manganese steel. Three kinds of high manganese steel samples are added in 3.5% NaCl solution with different concentrations of KHSO4. When the concentration of hydrogen sulfate ion is very low, the hydrogen sulfate ion will inhibit the corrosion to some extent, and with the increase of hydrogen sulfate ion concentration, the adsorption of hydrogen sulfate ion and chloride ion on the surface of high manganese steel will be competitive, and when the concentration of hydrogen sulfate ion is very low, hydrogen sulfate ion will play a certain role in inhibiting the corrosion. The number of hydrogen sulfate ions adsorbed on the surface of high manganese steel increased, which accelerated the corrosion of high manganese steel and decreased the corrosion resistance of high manganese steel. With the increase of the concentration of NaOH solution, the corrosion resistance of high manganese steel increases gradually. It is proved that OH- can inhibit the corrosion of high manganese steel by Cl-, and the corrosion resistance of nanocrystalline high manganese steel in Cl- and OH- corrosion medium is obviously better than that of original high manganese steel and deformed high manganese steel, which indicates that the steel material with nanocrystalline structure has excellent corrosion resistance.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG142.1

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