防锈油膜在5% Na2SO4溶液中的半导体导电行为

采用电位—电容法及Mott-Schottky分析技术研究了自腐蚀电位条件下防锈油膜在5% Na2SO4溶液中失效过程的导电机制转变行为.防锈油膜在5% Na2SO4溶液中的失效过程存在半导体导电特征，随着浸泡时间的延长，防锈油膜从浸泡初期的p型半导体转变为n型半导体，转变过程中，防锈油膜中出现两个空间电荷过渡层.随着浸泡时间的延长，防锈油膜中的空间电荷层厚度皆逐渐减小，载流子密度则逐渐增加，并且计算了不同转变时期防锈油膜中的电子给体（ND）和电子受体（NA）密度大小.     

304不锈钢钝化膜在不同溶液中的半导体导电行为

采用电位-电容法及Mott-Schottky分析技术研究了自腐蚀电位条件下304不锈钢钝化膜在酸、碱性溶液中的半导体导电行为.研究表明,304不锈钢钝化膜在不同溶液体系中表现出不同的导电特征,在5‰H2SO4溶液中,呈现两个空间电荷层,扫描电位低于0VSCE,钝化膜呈现p型半导体导电特征.而扫描电位大于0VSCE,钝化膜呈现n型半导体导电特征.钝化膜在5%NaOH溶液中呈现p型半导体导电特征.在不同溶液中载流子浓度随着浸泡时间的延长变化不大.     

防锈油膜失效之前的电位变化

采用丝束电极研究防锈油膜失效之前的电位变化,结果表明,防锈油膜失效之前,涂油丝束电极腐蚀电位在（－０．２￣０．３Ｖ ｖｓ ＳＣＥ）范围内分布,呈现一定程度的不均匀性,防锈油膜失效之前,涂油丝束电极腐蚀电位随着浸泡时间而发生变化,在浸泡初期,随着浸泡时间的延长,腐蚀电位分布发生一定程度的正移,当腐蚀电位分布达到最大值时,随着浸泡时间的延长,腐蚀电位开始发生负移。防锈油膜失效之前,涂油丝束电极腐蚀电位     

一种新型长效纳米环氧涂料的电位-电容行为研究

采用电位-电容法及Mott—Schottky分析法研究了一种新型长效纳米环氧涂料在5％Na2SO4溶液浸泡过程中的导电行为转变。研究表明，该种新型长效纳米涂料具有非常好的防护阻隔效果。随着浸泡时间的延长，该涂料在失效过程中也存在半导体导电特征。     

有机清漆在5％氢氧化钠溶液中的半导体导电行为

采用电位-电容法及Mott-Schottky分析技术研究了有机清漆在5%氢氧化钠溶液中的半导体导电行为.研究表明,有机清漆空间电荷层电容(Capacitance of space chargelayer,Csc)远小于裸露碳钢电极,随着浸泡时间的延长,其Csc逐渐增大,其空间电荷层逐渐减小.有机清漆在5%氢氧化钠溶液中呈现不同类型的半导体导电特征,环氧清漆膜呈绝缘体,而酚醛和醇酸清漆膜则表现为双极膜特征,在电位(-0.3～0 V)范围呈p型半导体,在电位(0～0.4 V)范围呈n型半导体,且随着浸泡时间的延长,漆膜中载流子浓度逐渐增加.     

AISI304不锈钢钝化膜在电解质溶液中腐蚀时的半导体性质

应用电位-电容测试和Mott-Schottky分析技术研究了AISI304不锈钢钝化膜在电解质溶液中的半导体性质.结果表明,不锈钢钝化膜在氢氧化钠溶液中,随着浸泡时间延长,半导体类型转变电位发生负移;在硫酸、硫酸钠两种溶液中转变电位无明显变化.随着腐蚀时间的延长,溶液中不锈钢钝化膜的载流子密度逐渐增加,其载流子密度在几种溶液中从小到大的顺序依次为硫酸钠,氢氧化钠,硫酸.不锈钢在三种溶液中的Mott-Schottky曲线均出现频率分化,其原因可能为钝化膜中载流子的产生-复合存在时间效应;在氢氧化钠溶液中,钝化膜腐蚀的主要原因为富铬层导电能力增强;在硫酸、硫酸钠两种溶液中,钝化膜腐蚀的主要原因为富铁层导电能力的增强.     

防锈油的流平温度对防锈油膜电化学不均匀性的影响

采用丝束电极研究了防锈油涂覆工艺中的流平温度对防锈油膜不均匀性的影响，研究表明，流平温度不影响防锈油膜腐蚀电位分布的不均匀性及其分布规律；流平温度对极化电阻分布规律有一定的影响。随着油溶性缓蚀剂浓度的增加，防锈油膜的腐蚀电位分布和阳极极化电阻（Ra)分布服从不连续二项分布，阴极极化电阻（Rc)分布从不连续二项分布向连续二项分布及对数正态分布转变。研究说明，流平温度高有利于改善防锈油膜的腐蚀电位和极化电阻的分布。     

镀锌层表面钝化膜在5%NaCl溶液中的腐蚀降解过程和半导体行为

采用扫描电化学显微镜(SECM)分析技术、电化学阻抗谱(EIS)和电容-电位测试研究了镀锌层表面钝化膜在质量分数5%NaCl溶液中的腐蚀降解过程和半导体行为。结果表明:浸泡过程中随着水和离子逐渐侵入钝化膜,钝化膜发生着缓慢的腐蚀降解,钝化膜在浸泡初期保持稳定,能够对基体金属起到较好的保护作用;钝化膜表现出n型半导体特征,随着浸泡时间的延长,Mott-Schottky曲线拟合直线的斜率逐渐减小,钝化膜载流子密度逐渐增大,表明钝化膜在浸泡过程中发生缓慢的腐蚀降解。     

防锈油膜失效期间的电位波动现象

采用丝束电极研究了防锈油膜失效期间的电位波动现象。研究表明，防锈油膜具有自修复能力，具这种自修复能力与油溶性缓蚀剂的浓度和种类有关；采丝束电极研究和评介防锈油膜的自修复能力是可行的。     

有机清漆在5‰硫酸溶液中的半导体导电行为

采用电位-电容法及Mott-Schottky分析技术研究了有机清漆在5‰硫酸溶液中的半导体导电行为.研究表明,有机清漆空间电荷层电容远小于裸露碳钢电极,随着浸泡时间的延长,其Csc逐渐增大,其空间电荷层逐渐减小;有机清漆在5‰硫酸溶液中呈现不同类型的半导体导电特征,酚醛和环氧清漆膜呈n型半导体,而醇酸清漆膜则表现为p型半导体特征,且随着浸泡时间的延长,漆膜中载流子浓度逐渐增加.     

平整液对防锈油防护性能的影响

采用丝束电极研究了平整液对防锈油防护的影响。研究表明,涂油丝束电极在浸泡初期,随着浸泡时间的延长,腐蚀电位平均值发生一定程度的正移。当腐蚀电位平均值达到最大值时,随着浸泡时间的工,腐蚀电位开始发生负 ,这一过程与油膜下发生的金属腐蚀过程有关。平整液对防锈油防护性能的影响表现在对涂油丝束电极腐蚀电位平均值及其方差随油膜下金属腐程度的变化上,经过比较,发现ＳＰ３平整液不影响涂油丝束电极腐蚀电位的分布,     

The effect of ionic peneration on semiconducting behaviour of temporarily protective oil coating on the surface of AISI 304 stainless steel

In this paper, the semiconducting behaviour of temporarily protective oil coatings on the surface of naked and prepassivated AISI 304 stainless steel immersed in 3% aqueous NaCl solution was studied by utilizing potential‐capacitance methode, Mott‐Schottky analysis and impedance analysis. It was pointed out that the temporarily protective oil coating behaves as a semiconductor during its degradation. The ionic penetration and the substrate greatly affect the conduction behaviour of the oil coating. On the surface of naked AISI 304 stainless steel, the oil coating behaves as a n‐type semiconductor. With increasing immersion time, the donor density of the space charge layer in the temporarily protective oil coating increases from 10¹⁹ to 10²⁵ m^?3. However, on the surface of the prepassivated substrate the space charge layer in the oil coating is significantly affected by the oxide on the steel electrode. In this case immersion time does not influence the density of charge carriers in the oil coating (10²¹ m^?3). Impedance analysis also verify above results.     

防锈油膜腐蚀电位分布的不均匀性

对防锈油膜腐蚀电位分布不均匀性及电位服从不连续二项分布进行了理论分析,探讨了防锈油膜腐蚀电位分布不均匀性的原因,并与实际测量的结果进行了比较。研究表明,理论分析结果与实际测量相符合。防锈油膜腐蚀电位分布不均匀性且服从不连续二项分布的原因在于防锈油膜存在离子及电子导电膜两种类型。     

静电喷涂防锈油(脱脂型)的研究和应用

脱脂型的静电喷涂油,是一种耐电压性较高的绝缘油。应用静电喷涂工艺, 涂于钢板表面,涂油均匀,油耗低,防锈性好。这种防锈 涂于钢板表面后,能满足汽车工业、家电行业等用户的需要。     

采用丝束电极研究防锈油膜的防护性能

将１０１根金属丝聚集成束，制成一种检测防锈油膜防护性能的新型测试电极，测定了涂油丝束电极的腐蚀电位和油膜电阻的分布。结果表明，腐蚀电位分布服从非连续二基分布。油膜极化电阻分布服从对数正态分布。     

模糊聚类分析评价防锈油膜电化学不均匀性

采用虎法构造的模糊聚类分析，用于防锈油膜电化学不均匀性研究，通过对防锈油膜电化学不均匀参数的解析，可以对防锈油膜进行快速分类和评价，研究表明，防锈油膜存在三种类的膜，即腐蚀性膜，保护性膜和不稳定膜。     

Study of electronic‐ionic conducting transformation of temporarily protective oil coating in salt solution

In this paper, a multiple microelectrode array was developed to study the electronic‐ionic conducting transition of temporarily protective oil coating in salt solution. It was pointed out that there existed electronic‐ionic transition of temporarily protective oil coating in salt solution varying with immersion time. At the early stage of immersion, the oil coating was an electronic conductor, which having very low conductivity. With increasing of immersion time, the oil coating transformed from electronic conductor to ionic conductor, where ionic diffusion in the coating was predominant. Based upon Bailey and Ritchie's general electrochemical theory for the oxidation of metals, an electrochemical analysis of potential inhomogeneity of the oil coating was presented. It was assumed that only one step could be rate‐determining in the overall reaction in the metal/oil film/solution system. It was predicted that there were two kinds of film in the temporarily protective oil coating, ionic and electronic conducting film. For the ionic conducting film, potentials of oil coated electrode were equal to equilibrium potential of metal oxidation at the metal/coating interface (E_a^eq), and it had the most negative value. For the electronic conducting film, potentials obtained were equal to the equilibrium potential of the oxidant reduction at the coating/electrolyte interface (E_c^eq), and it had the most positive value. Potential measurements in this paper verified the results of Wormwell and Brasher's research in 1949; the distribution of potential on oil‐painted wire beam electrodes being heterogeneous and following a discontinuous binomial probability distribution were also elucidated.     

Effect of immersion time in a modified green death solution on the rust layer of Cu-containing low-alloy steel

The corrosion resistance of low-alloy steel containing 0.35 wt% copper, as a function of immersion time in a modified green death solution, was investigated using electrochemical methods and surface analysis. After 30 min of immersion, the steel surface was covered with a Cu-enriched film. Improvement of the film properties and increases in the corrosion resistance were realized for the immersion time up to 6 h due to the development of the Cu-enriched layer. However, the Cu particle was formed in the Cu-enriched layer for the immersion time beyond 6 h. Since the formation of the Cu particle generated a Cu-depletion region, micro-galvanic corrosion between the Cu particle and the Cu-depletion region lead to the localized film breakdown on the surface film. The localized film breakdown, which decreased the corrosion properties of the Cu-containing steel, was accelerated by the continuous formation of Cu particles in the rust layer.