超高强度马氏体时效钢在酸性环境中的腐蚀行为与机理研究
发布时间：2019-03-15 22:12
【摘要】：00Ni18Col2Mo5Ti马氏体时效钢是高合金超高强度钢的一个典型钢种,其性能特点是在具有超高强度的同时具有良好的韧性,并且热处理工艺简单。在实际应用中,更准确的了解和认识00Ni18Co12Mo5Ti马氏体时效钢的耐腐蚀性能,对充分发挥该钢的超高强度和高韧性具有重要的实际应用价值。本文通过化学浸泡法、电化学测试法、形貌观察法和成分分析法对超高强度马氏体时效钢在酸性FeCl3环境中的腐蚀行为与机理进行综合、深入研究,得到了00Ni18Co12Mo5Ti钢在强氧化性的HNO3溶液和还原性的H2S溶液两种预处理后的耐腐蚀性能差异,并将其与15-5PH马氏体不锈钢和40Cr低合金钢在FeCl3溶液中的耐腐蚀性能进行了对比。本文的研究结果对该钢种的使用寿命的估算具有参考价值,对钢铁企业节能减排也有重要的实践意义。运用浸泡腐蚀失重法对比经HNO3钝化后与H2S预处理后三种材料的腐蚀速率、表面宏观、微观形貌等特性,研究结果显示00Ni18Co12Mo5Ti钢宏观腐蚀形貌为河流冲刷状,微观则显示蜂窝带孔状,耐腐蚀性能较为稳定；15-5PH不锈钢呈现典型点蚀形貌,经H2S预处理后,浸泡36h时点蚀孔直径达到了752.6μm,是HN03钝化后点蚀孔直径76.1μm的10倍大小；40Cr低合金钢在两种环境下都表现出了严重的剥落腐蚀形貌。硝酸钝化浸泡腐蚀36h后00Ni18Co12Mo5Ti钢的腐蚀速度为9g/m2.h,比15-5PH不锈钢高了9倍,是40Cr低合金钢的0.4倍。氢硫酸处理后00Ni18Co12Mo5Ti钢在前期腐蚀速度比不锈钢稍快,而36h后的腐蚀速度为9.5g/m2·h,低于15-5PH不锈钢(11g/m2·h),是40Cr低合金钢的0.2倍。三种试样在36h前的腐蚀速率很快,36h后腐蚀速率趋于稳定,表明对金属材料腐蚀的防护,前期是重点。Tafel极化曲线数据显示三种材料经预处理后都出现了较为明显的钝化现象,腐蚀电位和腐蚀电流变化趋势与浸泡腐蚀速率基本吻合。运用电化学测试、腐蚀形貌观察和能谱分析等试验,对比分析了00Ni18Co12Mo5Ti钢极化曲线、交流阻抗谱图、表面微观腐蚀形貌和能谱等特性,本文研究得出经过预处理后的试样表面会形成良好的保护膜,HN03钝化膜效果更好,预处理后的腐蚀性都具有较好的稳定性。金相显示00Ni18Co12Mo5Ti钢在腐蚀初期表现出了明显的晶间腐蚀倾向；SEM形貌显示,腐蚀36h后微孔直径稳定在40μm,试样在36h前表面为河流冲刷状形貌,没有产生明显的孔洞；36h开始产生蚀孔,随着周期的延长,蚀孔直径也不断增大,腐蚀后期在蚀孔内部又开始出现新的孔蚀现象。能谱结果显示00Ni18Co12Mo5Ti马氏体时效钢的主要腐蚀产物是稳定态的Fe2O3。热处理后00Ni18Co12Mo5Ti钢的板条马氏体晶粒和组织得到细化,析出物分布更加弥散均匀。对九种热处理后试样进行腐蚀测试试验,其结果显示,固溶温度的增加会使试验材料腐蚀失重速率增大,腐蚀电位降低,Tafel极化曲线阴极区域减小,耐腐蚀性降低。时效温度相同时,随时间的延长腐蚀电位呈增加趋势,而且时间短的试样表现出的钝化效果更好。对比不同热处理后腐蚀电位、腐蚀电流密度与硬度、晶粒度的变化趋势,发现试样硬度高时腐蚀电流密度大,试样的耐腐蚀性差。表面钝化处理和化学镀均能在试验材料表面形成有效的保护膜,提高材料的耐腐蚀性能。
[Abstract]:The 00Ni18Col2Mo5Ti maraging steel is a typical steel grade of high-alloy ultra-high strength steel, and has the characteristics of good toughness at the same time with ultra-high strength and simple heat treatment process. In the practical application, the corrosion resistance of 00Ni18Co12Mo5Ti maraging steel is more accurately known and recognized, and the high strength and the high toughness of the steel are of great practical application value. In this paper, the corrosion behavior and mechanism of the ultra-high-strength maraging steel in the acidic FeCl3 environment are comprehensively and deeply studied by chemical soaking method, electrochemical test method, appearance observation method and component analysis method. The corrosion resistance of 00Ni18Co12Mo5Ti steel in the strong oxidizing HNO 3 solution and the reducing H2S solution can be different, and the corrosion resistance of the 15-5PH martensitic stainless steel and the 40Cr low-alloy steel in FeCl3 solution can be compared. The results of this paper are of reference value to the estimation of the service life of the steel, and it is of great practical significance to the energy-saving and emission reduction of iron and steel enterprises. The corrosion rate, surface macroscopic and micro-morphology of the three kinds of materials after the passivation of HNO3 and the pretreatment of H2S were compared by the immersion corrosion weight loss method. The results show that the macro-corrosion morphology of the 00Ni18Co12Mo5Ti steel is a river-washed shape, and the micro-structure shows that the honeycomb strip is porous and the corrosion resistance can be more stable; The typical pitting appearance of 15-5PH stainless steel, after the pretreatment of H2S, the diameter of the pitting hole reached 752.6. m after soaking for 36 h, which is 10 times the diameter of the pitting hole after the passivation of the HN03, and the diameter of the pitting hole is 76.1. m The corrosion rate of 00Ni18Co12Mo5Ti steel after passivation and immersion of nitric acid for 36 h is 9 g/ m2.h, which is 9 times higher than that of 15-5PH stainless steel, and is 0.4 times that of 40Cr low alloy steel. The corrosion rate of 00Ni18Co12Mo5Ti steel after hydrosulfuric acid treatment was slightly faster than that of the stainless steel, and the corrosion rate after 36 h was 9.5 g/ m2 路 h, and the corrosion rate was less than 15-5PH stainless steel (11g/ m2 路 h), which was 0.2 times that of the 40Cr low alloy steel. The corrosion rate of the three samples before 36h is very fast, and the corrosion rate is stable after 36 h, which indicates the protection of the corrosion of the metal material, and the earlier stage is the key point. The data of Tafel polarization curve shows that the three kinds of materials have obvious passivation phenomenon after the pretreatment, and the corrosion potential and the corrosion current trend are basically in agreement with the soaking corrosion rate. The polarization curves of 00Ni18Co12Mo5Ti steel, the AC impedance spectrum, the surface micro-corrosion and the energy spectrum of 00Ni18Co12Mo5Ti steel were compared and analyzed by means of electrochemical test, corrosion profile observation and energy spectrum analysis. HN03 passivation film has better effect and good stability after pre-treatment. The metallographic examination showed that the corrosion tendency of 00Ni18Co12Mo5Ti steel in the early stage of corrosion showed obvious intercrystalline corrosion tendency; the morphology of SEM showed that the pore diameter was stable at 40. m after 36 h of corrosion, the surface of the sample was a fluvial-like shape at the front surface of 36h, no obvious hole was produced, and the corrosion hole began to be generated at 36h, and with the extension of the period, The diameter of the etching hole is also increasing, and a new pitting phenomenon is started in the corrosion hole at the later stage of the corrosion. The results show that the main corrosion products of the 00Ni18Co12Mo5Ti maraging steel are the stable Fe2O3. The lath martensite grains and the microstructure of 00Ni18Co12Mo5Ti steel after heat treatment were refined, and the distribution of the precipitates was more uniform. The results show that the corrosion-loss rate of the test material is increased, the corrosion potential is reduced, the cathode region of the Tafel polarization curve is reduced, and the corrosion resistance is reduced. When the aging temperature is the same, the corrosion potential is increased with the time, and the passivation effect of the sample with the short time is better. The change trend of corrosion potential, corrosion current density and hardness and grain size after different heat treatment was compared, and it was found that the corrosion current density was high when the sample hardness was high, and the corrosion resistance of the sample was poor. And the surface passivation treatment and the chemical plating can form an effective protective film on the surface of the test material to improve the corrosion resistance of the material.
【学位授予单位】：扬州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG142.1;TG172
本文编号：2441026
[Abstract]:The 00Ni18Col2Mo5Ti maraging steel is a typical steel grade of high-alloy ultra-high strength steel, and has the characteristics of good toughness at the same time with ultra-high strength and simple heat treatment process. In the practical application, the corrosion resistance of 00Ni18Co12Mo5Ti maraging steel is more accurately known and recognized, and the high strength and the high toughness of the steel are of great practical application value. In this paper, the corrosion behavior and mechanism of the ultra-high-strength maraging steel in the acidic FeCl3 environment are comprehensively and deeply studied by chemical soaking method, electrochemical test method, appearance observation method and component analysis method. The corrosion resistance of 00Ni18Co12Mo5Ti steel in the strong oxidizing HNO 3 solution and the reducing H2S solution can be different, and the corrosion resistance of the 15-5PH martensitic stainless steel and the 40Cr low-alloy steel in FeCl3 solution can be compared. The results of this paper are of reference value to the estimation of the service life of the steel, and it is of great practical significance to the energy-saving and emission reduction of iron and steel enterprises. The corrosion rate, surface macroscopic and micro-morphology of the three kinds of materials after the passivation of HNO3 and the pretreatment of H2S were compared by the immersion corrosion weight loss method. The results show that the macro-corrosion morphology of the 00Ni18Co12Mo5Ti steel is a river-washed shape, and the micro-structure shows that the honeycomb strip is porous and the corrosion resistance can be more stable; The typical pitting appearance of 15-5PH stainless steel, after the pretreatment of H2S, the diameter of the pitting hole reached 752.6. m after soaking for 36 h, which is 10 times the diameter of the pitting hole after the passivation of the HN03, and the diameter of the pitting hole is 76.1. m The corrosion rate of 00Ni18Co12Mo5Ti steel after passivation and immersion of nitric acid for 36 h is 9 g/ m2.h, which is 9 times higher than that of 15-5PH stainless steel, and is 0.4 times that of 40Cr low alloy steel. The corrosion rate of 00Ni18Co12Mo5Ti steel after hydrosulfuric acid treatment was slightly faster than that of the stainless steel, and the corrosion rate after 36 h was 9.5 g/ m2 路 h, and the corrosion rate was less than 15-5PH stainless steel (11g/ m2 路 h), which was 0.2 times that of the 40Cr low alloy steel. The corrosion rate of the three samples before 36h is very fast, and the corrosion rate is stable after 36 h, which indicates the protection of the corrosion of the metal material, and the earlier stage is the key point. The data of Tafel polarization curve shows that the three kinds of materials have obvious passivation phenomenon after the pretreatment, and the corrosion potential and the corrosion current trend are basically in agreement with the soaking corrosion rate. The polarization curves of 00Ni18Co12Mo5Ti steel, the AC impedance spectrum, the surface micro-corrosion and the energy spectrum of 00Ni18Co12Mo5Ti steel were compared and analyzed by means of electrochemical test, corrosion profile observation and energy spectrum analysis. HN03 passivation film has better effect and good stability after pre-treatment. The metallographic examination showed that the corrosion tendency of 00Ni18Co12Mo5Ti steel in the early stage of corrosion showed obvious intercrystalline corrosion tendency; the morphology of SEM showed that the pore diameter was stable at 40. m after 36 h of corrosion, the surface of the sample was a fluvial-like shape at the front surface of 36h, no obvious hole was produced, and the corrosion hole began to be generated at 36h, and with the extension of the period, The diameter of the etching hole is also increasing, and a new pitting phenomenon is started in the corrosion hole at the later stage of the corrosion. The results show that the main corrosion products of the 00Ni18Co12Mo5Ti maraging steel are the stable Fe2O3. The lath martensite grains and the microstructure of 00Ni18Co12Mo5Ti steel after heat treatment were refined, and the distribution of the precipitates was more uniform. The results show that the corrosion-loss rate of the test material is increased, the corrosion potential is reduced, the cathode region of the Tafel polarization curve is reduced, and the corrosion resistance is reduced. When the aging temperature is the same, the corrosion potential is increased with the time, and the passivation effect of the sample with the short time is better. The change trend of corrosion potential, corrosion current density and hardness and grain size after different heat treatment was compared, and it was found that the corrosion current density was high when the sample hardness was high, and the corrosion resistance of the sample was poor. And the surface passivation treatment and the chemical plating can form an effective protective film on the surface of the test material to improve the corrosion resistance of the material.
【学位授予单位】：扬州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG142.1;TG172
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