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人工神经网络直读光谱法测定钢中酸溶铝 总被引:1,自引:0,他引:1
用火花直读光谱法测定钢中不同状态的铝是目前研究的热点之一。本文确立了直读光谱法的分析条件,将人工神经网络用于直读光谱法,用直读光谱的全铝光谱强度值作为网络的输入,标样中的酸溶铝值作为期望值,建立神经网络模型,用神经网络直读光谱法测定中低合金钢中酸溶铝含量,分析结果的准确度与化学分析法基本一致。神经网络使用改进的BP算法,避免了学习过程可能产生的麻痹现象,提出了目标向量的简单变换方法。该法用于钢中酸溶铝的直接测定,获得满意结果。 相似文献
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峰值积分法分析铝的研究与应用 总被引:2,自引:1,他引:1
在直读光谱仪上,用峰值积分法测定低合金钢中铝,酸溶铝和酸不溶铝的含量,确定最佳分析条件,研究峰值积分法的分析机理,本方法用于测定低中不同状态铝,结果符合要求. 相似文献
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研究了氢氟酸酸溶法处理样品,直接用电感耦合等离子体-原子发射光谱法(ICP-AES)测定高纯石英砂中硼、磷微量杂质元素。通过优化仪器参数,利用软件扣除背景等方法,成功的消除了基体效应。方法用于高纯石英砂中硼和磷的测定,同时对一个土壤标准物质进行了检测对照,实验结果显示,B和P校准曲线的线性关系好,回收率范围在93.33%—105.00%之间,相对标准偏差均小于1%,对照实验结果与标准参考值无显著性差异。方法具有分析速度快、准确度高、精密度好、检出限低的特点,适用于高纯石英砂等材料中B、P含量的同时测定。 相似文献
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激光诱导击穿光谱(LIBS)具有分析速度快、非接触测量、表面微区分析以及易于实现在线实时监控分析等优点。通过LIBS对块状钢铁样品表面进行扫描分析,实现了钢中酸不溶铝含量的定量表征。铝的异常信号采用Nalimov迭代法剔除,以剩余信号强度的平均值加三倍标准偏差作为阈值强度,高于阈值强度的信号认为由酸不溶铝产生,反之由酸溶铝产生。在用含量校准曲线获得钢中总铝的含量后,分别根据酸不溶铝信号总强度或信号总个数与总铝信号之比,计算钢中酸不溶铝的含量。几种钢铁标准样品及实际生产板坯样品中酸不溶铝含量的对比分析结果表明,根据铝信号总强度获得的分析结果与传统湿法分析结果吻合得更好,可用于快速定量表征钢中酸不溶铝的含量。 相似文献
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优化了分子荧光法测定硼-变色酸络合物的实验条件,提出了一种新的形态分析方法-连续浸提法.方法检出限为3.28μg/L,相对标准偏差为3.91%.该方法应用于银杏叶中不同形态硼含量的测定,结果满意. 相似文献
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本文采用ICP-AES法对镍基、铁镍基高温合金与结构中微量硼元素的测定进行了研究,着重考察了镍基DZ125合金,铁镍基GH4169合金和结构钢的基体与合金元素对硼含量测定的影响,采用了分步沉淀分离方法,消除了铁(基体)、钨和铌,钽(合金中共存元素)对硼的干扰,测定了样品中微量硼,取得了满意的结果。 相似文献
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中低合金钢中不同形态铝硼的直读光谱分析法 总被引:3,自引:1,他引:2
在直读发射光谱仪上用峰值积分法(PIM)对中低合金钢中不同形态(固溶态和夹杂态)铝和硼的成分进行了测定,方法的精密度和准确度均能满足一般生产的要求。 相似文献
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A self-built experimental apparatus was employed to study the spectral emissivity of type E235B low carbon structural steel in the wavelength range 2–15 μm at different temperatures by energy comparison method. The surface roughness and topography of the steel E235B were determined by a roughness tester and a scanning electron microscopy, respectively. And then, the spectral emissivity of steel E235B with six different roughnesses was measured before and after oxidation. The measurement results showed that the spectral emissivity increased with the increasing temperature and surface roughness before oxidation. The effect of roughness on the spectral emissivity is different at different wavelength and temperature ranges. However, the oscillatory behavior of the spectral emissivity was observed after oxidation. To explore the possible reasons for emissivity variation, the changes of surface roughness and optical roughness were investigated after oxidation. It is found that both the surface roughness and optical roughness increased after oxidation. Although the optical roughness can be used as one of the parameters to evaluate the effect of surface roughness on the spectral emissivity, it is insufficient to describe the effect of surface morphology on the spectral emissivity. 相似文献
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钢中残量元素As,Sn,Sb的X射线荧光光谱分析 总被引:1,自引:0,他引:1
本文介绍了用日本理学3530XRF光谱仪扫描道测定钢中痕量元素As、Sn、Sb。由于短波强大的背景破坏了检测线的线性,通过用DATAFLEX 181B背景扣除的数据处理,消除了这些影响,成功地校准了曲线。方法简单;快速;XRFS结果与化学分析一致,该法已用于炼钢的过程控制和原材料分析。 相似文献
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本文介绍了国产7503B型光电直读光谱仪用于分析炉前熔清钢水中磷元素成分的一种方法,选择和确定了最佳工作条件,校准曲线和控制样品,此方法快速,准确,分析结果令人满意。 相似文献
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Dimensional analysis is presented as a powerful tool in the study of the paste boriding process. In particular, a dimensional method is used to study the growth kinetics of the boride layers FeB and Fe2B. Experiments were performed in AISI 1045 steel and AISI M2 steel, to test the suggested model. Samples of 1045 steel were prepared and treated using boron paste thickness of 3-5 mm, at temperatures of 1193, 1223 and 1273 K, with 2, 4 and 6 h of treatment time. The M2 specimens had boron paste thickness of 3 and 4 mm and temperatures of 1223, 1253 and 1273 K for 2 and 6 h. Results indicate that the growth of boron layers obeys power laws of the form y = αxβ, where α and β constants are a function of the material and the interface of interest. Validation of the model was carried out using experimental data with an average error percentage of 7.6% for Fe2B in 1045 steel, 15.8% for FeB and 3.4% for Fe2B in M2 steel. 相似文献
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Corrosion inhibiting performance of 1-hydroxyethyl-2-heptadecylimidazoline (A) and 1-aminoethyl-2-heptadecylimidazoline (B) for mild steel was evaluated by combination of quantum chemistry calculation, molecular mechanics, and molecular dynamics simulation. The calculated results by quantum chemistry method demonstrated that frontier orbitals of A and B molecules are mainly located on imidazoline rings, and molecule B possesses higher reactivity than molecule A. The calculated results by molecular mechanics and molecular dynamics simulation presented that these two inhibitor molecules could form dense and high-coverage membranes to prevent diffusion of reactive corrosive species to metal surface. Furthermore, the adsorption energy, cohesive energy, and adsorption angle demonstrated that the binding affinity and stability of B membrane was remarkably greater than that of A, which indicated that B had better inhibition performance in CO2 corrosion. The calculated results were well accorded with previous reported experimental results. These researches implied that molecular modeling might be an effective approach to assess inhibition performance, which has potential application in design of new inhibitors. 相似文献
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ICP-AES同时测定镍锰钴硅铁铌硼合金中钴、铌、铁和硼 总被引:2,自引:0,他引:2
用全谱直读ICP-AES分析技术,对试样溶解方法、元素分析谱线、共存元素干扰、背景校正、仪器分析参数等进行了研究,综合确定了最佳实验条件。将镍锰钴硅铁铌硼合金试样用硝酸、氢氟酸溶解,ICP-AES直接测定钴、铌、铁、硼。测定范围为:Co0.5%—12%、Fe0.1%—3%、Nb0.1%—5%、B0.05%—1.0%。加标回收率为96.6%—103.7%,相对标准偏差为0.37%—4.56%。方法简便、快速、准确。 相似文献
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