Fe—Cr合金在450℃的KCl及KCl—ZnCl_2盐膜中的腐蚀

研究了Ｆｅ－１０Ｃｒ,Ｆｅ－２５Ｃｒ两种合金在４５０℃于Ｋ,Ｚｎ 氯化物中的腐蚀．结果表明,与在ＫＣｌ－ＺｎＣｌ２熔盐中的 腐蚀不同．合金无论在固态的 ＫＣｌ还是熔融态的 ＫＣｌ－ＺｎＣｌ２盐膜下均发生了加速腐蚀,且在混合盐膜下的腐蚀更为严重,合金 的耐蚀性不随 Ｃｒ含量的增加而得到改善：Ｆｅ—Ｃｒ合金在上述两种腐蚀条件下的耐蚀性差异与氧的供应量有关,并导致保护性的 氧化膜具有不同的热力学稳定性     

Zn－Fe合金电镀的应用与发展

综述了各种Ｚｎ－Ｆｅ合金电镀工艺的特点及研究应用现状，重点对比研究了各种络合体系的碱性锌酸盐Ｚｎ－Ｆｅ合金电镀工艺．结果表明，含铁量≤０．８％的Ｚｎ－Ｆｅ合金镀层，可以直接经铬酸盐钝化处理而大幅度提高膜层的耐蚀性能．     

Fe—Mn—Al合金的腐蚀性能与钝化膜的研究

应用阳极极化及ＡＥＳ／ＸＰＳ技术，研究了Ｆｅ－３０．８Ｍｎ－８．２Ａｌ奥氏体合金在ｐＨ值为－０．８至１５．３的水溶液中的腐蚀性能，并与Ｆｅ－３０Ｍｎ合金，低碳钢，９％Ｎｉ低温钢及１Ｃｒ１３不锈钢进行对比。在所测试的水溶液中，该合金的腐蚀抗力优于低碳钢的Ｆｅ－３０Ｍｎ合金，与９％Ｎｉ钢相当，但不及１Ｃｒ１３不锈钢。     

Fe—Mn─Al合金的腐蚀性能与钝化膜的研究

应用阳极极化及ＡＥＳ／ＸＰＳ技术,研究了Ｆｅ－３０．８Ｍｎ－８．２Ａｌ奥氏体合金在ｐＨ值为－０．８至１５．３的水溶液中的腐蚀性能,并与Ｆｅ－３０Ｍｎ合金、低碳钢、９％Ｎｉ低温钢及１Ｃｒ１３不锈钢进行对比。在所测试的水溶液中,该合金的腐蚀抗力优于低碳钢和Ｆｅ－３０Ｍｎ合金,与９％Ｎｉ钢相当,但不及１Ｃｒ１３不锈钢。Ｆｅ－３０．８Ｍｎ－８．２Ａｌ合金在１ｍｏｌ／ＬＮａ２ＳＯ个中形成的钝化膜的最表层可能为氢氧化物,而膜的主体由Ｆｅ２Ｏ３、Ｍｎ２Ｏ３及Ａｌ２Ｏ３组成。     

Nd-Fe-B合金的腐蚀及防蚀表面处理

研究了在环境腐蚀试验条件下Ｎｄ－Ｆｅ－Ｂ合金的腐蚀行为及腐蚀对其磁性能的影响,并提出了防止腐蚀的表面处理方法。试验结果表明,Ｎｄ－Ｆｅ－Ｂ合金有较高的腐蚀速率,腐蚀后Ｎｄ－Ｆｅ－Ｂ合金的磁性能降低。化学镀Ｎｉ－Ｐ及电泳涂装的复合表面处理方法,具有良好的防蚀效果。     

电镀Zn—Fe合金

在碱性锌酸盐电解液的基础上，通过添加适量的二价铁盐及铁络合剂，制备Ｚｎ－Ｆｅ合金镀层。确定了获取Ｚｎ－０．３＾－０．５％Ｆｅ合金镀层的电解液成分及工艺条件，实验结果表明，其耐蚀性优于普通镀锌层。     

Fe—Cr合金在650℃熔融（Li—K）2CO3中的腐蚀行为

研究了纯铁,Ｆｅ－５Ｃｒ,Ｆｅ－１０Ｃｒ,Ｆｅ－２０Ｃｒ、Ｆｅ－２５Ｃｒ合金在６５０℃熔融（０．０６２Ｌｉ－０．３８Ｋ）２ＣＯ３（摩尔分数）中和空气气氛下的腐蚀行为,结果表明,纯铁,Ｆｅ－５Ｃｒ及Ｆｅ－１０Ｃｒ合金均遭受较快腐蚀,Ｃｒ的加和量在１０以下无助于改善Ｆｅ的耐蚀性能,而Ｃｒ的加入量为２０和２５则能显著改善Ｆｅ的耐腐蚀性能,讨论了纯铁及Ｆｅ－Ｃｒ合金的腐蚀机制。     

Fe—Cr合金在650℃共晶（Li,K）2CO3熔盐中的腐蚀电化学阻抗谱研究

应用电化学阻技术并结合物相分析技术研究了合金元素Ｃｒ对Ｆｅ在６５０℃（Ｌｉ,Ｋ）２ＣＯ３共晶熔盐中的腐蚀行为的影响。结果表明,加入５％和１０％Ｃｒ不能改善Ｆｅ的耐腐蚀性能,而加入２０％和２５％Ｃｒ则能显著提高其耐腐蚀性能;Ｆｅ及Ｆｅ－Ｃｒ合金腐蚀电化学阻抗谱呈双容抗弧特征,合金腐蚀受荷电粒子在氧化膜中的迁移控制。提出将合金表面形成的氧化膜理想化为一电容器,并建立了氧化物电容与双电层电容相串联的等效电路来描述合金腐蚀的阻抗特征.此外,根据所提供等效电路对合金腐蚀电化学阻抗谱进行了解析.     

Fe—Ni—Cr合金在H2S／H2／CO2混合气氛中的高温腐蚀

研究了铬含量相当，镍含量分别为１８ｗｔ％和３９ｗｔ％的两种Ｆｅ－Ｎｉ－Ｃｒ合金在Ｈ２Ｓ／Ｈ２／ＣＯ２混合气氛中于６００℃的腐蚀动力学产物层结构。镍含量不同使腐蚀产物结构上有差异；１８ｗｔ％Ｎｉ合金的外腐蚀层为ＦｅＳ，其下是ＦｅＣｒ２Ｓ４和Ｃｒ３Ｓ４；而３９ｗｔ％Ｎｉ合金的腐蚀产物外层是疏松多孔，呈黑色粉状的（Ｎｉ，Ｆｅ）Ｓ，其下也是ＦｅＣｒ２Ｓ４与Ｃｒ３Ｓ４；而３９ｗｔ％Ｎｉ合金的腐蚀产物外层是疏     

Zr—Nb系合金耐蚀性能研究

结合核动力堆用燃料包壳对锆合金耐蚀性能的要求，大范围考察了Ｎｂ含量为０．５％，１．０％，２．６％（ｗｔ％）的Ｚｒ—Ｎｂ二元合金及含Ｃｒ、Ｍｏ、Ｓｎ、Ｂｉ、Ｆｅ、Ｃｅ和Ｓｉ的Ｚｒ－１Ｎｂ及多元合金，共１７种成分的Ｚｒ－Ｎｂ系合金在４００℃，１０．３ＭＰａ水蒸汽中的长期腐蚀规律（达１８２天）。在腐蚀转折前，Ｚｒ－Ｎｂ系合金的腐蚀动力学曲线均近似于抛物线规律，而在转折之后存在与线性规律偏离现象。长期腐蚀增重的分析说明：通过合理的多元合金化，即增加或降低Ｎｂ含量，并主加Ｆｅ、Ｂｉ、Ｓｎ和Ｎｉ而辅加少量的Ｃｒ、Ｍｏ     

The corrosion behavior of several heat resistant materials in air + 2 vol‐% Cl2 at 300 to 800 °C. Part I – Fe‐base and Fe‐containing alloys

In the present paper the corrosion behavior of 2 1 / 4 Cr1Mo steel, Alloys 800H, AC66, 45TM and 690 was investigated at 300 to 800 °C in dry air and synthetic air with 2 vol.‐% Cl₂. The data reveal that the major role determining corrosion resistance are played by Fe in the alloys. In particular if the same Cr‐contents are present in the alloys it is only the Fe content which decides on resistance against Cl‐attack while additions of even almost 3 % of Si evidently have only little effort.     

Structural and corrosion characterization of biodegradable Mg–RE (RE=Gd,Y, Nd) alloys

Binary Mg–Gd (up to 5% Gd in mass fraction), Mg–Nd (up to 9% Nd in mass fraction) and ternary Mg–Gd-Y (up to 5% Gd, 1% Y) alloys with precisely determined contents of cathodic impurities (Fe, Ni, Cu, Co) were studied. The alloys were studied in the as-cast state (cooling rate of 500 K/min) and after solution heat treatment (T4). Structures were investigated by optical and scanning electron microscopy, energy dispersive spectrometry, X-ray diffraction and glow discharge spectrometry. Structural investigation was completed by Vickers hardness measurements. Corrosion behavior in the simulated physiological solution (9 g/L NaCl) was assessed by immersion tests and potentiodynamic measurements. It was found that the structures of the as-cast alloys were dominated by fine α-Mg dendrites and eutectic Mg–RE phases. The dendrites exhibited RE-concentration gradients which were most pronounced in the Mg–Gd alloys. For this reason, the T4 heat treatment of the Mg–Gd alloy led to the formation of a new cuboidal Mg₅Gd phase. The corrosion resistance was significantly improved by Gd. The effect of Nd was weak and the addition of Y to Mg–Gd alloys had harmful effect on the corrosion resistance. The T4 heat treatment strongly accelerated the corrosion of Mg–Gd alloys. Its effect on the corrosion of Mg–Nd alloys was not significant. The observed corrosion behavior of the alloys was discussed in relation to their structural states and contents of cathodic impurities.     

Corrosion of New Zirconium Claddings in 500 °C/10.3 MPa Steam: Effects of Alloying and Metallography

With the aim of improving corrosion resistance of rod cladding for in-service and accident conditions, six new zirconium alloys (named N1-N6) have been designed. The contents of Sn and Nb were optimized for better behavior at high-temperature pressurized water, and Fe, Cr, V, Cu or Mo elements were added to the alloys to adjust the corrosion behavior. The current work focused on the rapid corrosion behavior in 500 °C/10.3 MPa steam for up to 1960 h, aiming to test the corrosion resistance at high temperature. The structure of matrix and properties of second-phase particles (SPPs) were characterized to find the main differences among these alloys. All the six alloys exhibited better corrosion resistance than N36, and N1 was shown to have the best performance. A careful analysis of the corrosion kinetics curves revealed that Cr was beneficial for severe condition. Elements Fe, Cr, V, Cu or Mo aggregated into SPPs with different concentrations and structures. This was demonstrated to be the main reason for different corrosion resistance. Due to good processing control, all alloys had a uniform structure and a uniform distribution of SPPs. As for N4, N6 and N36, the existing of large-size SPPs (450 nm) might be a contributing factor of the relatively poor corrosion resistance.     

Improved Corrosion Resistance in AZ61 Magnesium Alloys Induced by Impurity Reduction

The effect of impurity element Fe on corrosion behavior of AZ61 magnesium alloys in various states has been investigated by immersion test and hydrogen evolution measurements in 3.5% sodium chloride solution.The corrosion rate is found to relay on the impurity Fe concentration in the alloys and decreases with decreasing Fe content.When Fe content drops from 150 ppm to 10 ppm,the corresponding corrosion rates under as-cast and solution treatment conditions are reduced from 8.54 mm/a and 8.61 mm/a to 2.54 mm/a and 0.21 mm/a,respectively.The corrosion pattern of the AZ61 alloys is the localized corrosion,and the galvanic couples are formed among the impurity particles,second-phase particles and the matrix.The Fe impurity particles tend to act as main cathodic to form micro-galvanic cell with the α-Mg matrix,which is harmful for corrosion resistance of AZ61 alloy.     

Al-Zr-M(M=Fe,Ce和Nd)合金在NaCl溶液中的腐蚀行为研究

用电弧熔炼方法制备了Al-Zr-M (M=Fe,Ce和Nd)合金,合金的相结构用XRD进行了分析,通过动电位线性极化法测试了上述合金在3.5% NaCl溶液中的电化学性能,对浸泡后合金的表面形貌用金相显微镜进行了分析。结果表明：Al-Zr合金中加入稀土元素后,在NaCl溶液中的钝化过程更明显,钝化电位更负,合金更易钝化,因而改善了合金的耐腐蚀性能;相比较而言含Nd的合金耐腐蚀性能更好。而Al-Fe-Zr合金为活性极化,腐蚀电流较大,较易腐蚀。     

Die Korrosion von Kupfer-Aluminium-Legierungen in schwefelsaurer Beizlösung

Corrosion of copper-aluminium alloys in sulfuric acid containing pickling solutions Wrought copper aluminium alloys (aluminium contents between 5 and 10 weight-%, additions of Fe, Ni and Mn) have been studied by continous and alternating immersion tests in a solution containing 20% H₂SO₄ and 10% FeSO₄ at 40°C. In the as-extruded state the corrosion of monophasic alpha alloys increases with aluminium content. Larger quantities of ß' martensite exercise a negative effect. Addition of 2 weight-% Ni do not improve the corrosion resistance of the alloys with 5 and 8% Al. Cold reduction of alpha alloys give rise to a pronounced intensification of corrosion. No positive effect can be obtained by a thermal treatment of the alloys CuAl 10 Fe 4 Mn Ni and CuAl 10 Fe 4 Ni 5. The corrosion takes place under the following forms: uniform corrosion (CuAl 5), preferred corrosion of grain boundaries (CuAl*, Cual 9, Mn 2 FeNi and CuAl 10 Fe 4 Ni 5 after thermal treatment) and dealuminisation (CuAl 10 Fe 4 Mn 3 Ni). With a view to corrosion resistance the alloys CuAl 5, CuAl8 CuAl 9 Mn and - probably - CuAl 8 Fe seem to be superior to the others.     

铁基非晶及纳米晶合金在NaOH溶液中的耐蚀性比较

冶炼制备了纳米晶Fe73.5Si13.5B9Nb3Cu1和非晶带材Fe78Si13B9。在电化学工作站上测试了两种合金在不同浓度的NaOH碱溶液里的极化曲线。随着NaOH溶液浓度的不同,非晶Fe78Si13B9和纳米晶Fe73.5Si13.5B9Nb3Cu1合金极化曲线具有相似的变化规律,且纳米晶合金比非晶合金的腐蚀电位要高,耐腐蚀性要好。     

Comparative study of stress corrosion cracking susceptibility of Fe18Cr10Mn- and Fe18Cr10Mn1Ni-based high nitrogen stainless steels

The stress corrosion cracking (SCC) behavior of Fe18Cr10Mn1Ni(0.3–0.8)N alloys was investigated in aqueous NaCl environment by using slow strain rate test method, and the results were compared to those of Ni-free counterparts. The addition of N tended to improve the SCC resistance of Fe18Cr10Mn- and Fe18Cr10Mn1Ni-based alloys. The alloying Ni magnified the beneficial effect of N on the SCC susceptibility and, eventually, the Fe18Cr10Mn0.8N alloy was immune to SCC in 2 M NaCl solution at 50 °C. The SCC behavior of the present alloys was found to be closely related to the repassivation tendency and the resistance to pitting corrosion.     

The Influence of Alloy Composition and microstructure on the corrosion behaviour of Cu-Ni alloys in seawater

The aim of the study was to relate the general corrosion behaviour of CuNi 10-alloys in seawater with its iron content and microstructure. To that end the microstructure of four commercial alloys with various Fe-contents (1.20-1.78%) and there laboratory melted alloys with various Fe-contents (1.5–2.5%) were investigated in the as delivered state and after three different heat treatments. Samples of these alloys were exposed to flowing natural seawater. During exposure electrochemical measurements were performed. After exposure the weight loss was determined. Moreover, for a number of samples the corrosion products were analysed by means of electron microprobe analysis. Irrespective of the Fe-content, the presence of discontinuous precipitates in the laboratory melted alloys turned out to be detrimental with regard to general corrosion. To a less extent this also holds for alloys with high concentrations of continuous precipitates, as observed for iron contents of 2 and 2.5%. The precipitate free alloys as well as the ones containing low concentrations of continuous precipitates because of low Fe-concentrations (<1.5%Fe) do show a good corrosion behaviour. The corrosion behaviour of commercial CuNi 10 Fe in the as received condition was generally comparable with that of laboratory melted alloys with continuous precipitates. The corrosion rates of the former do not exceed those of the latter, which are very low for practical applications. Finally the corrosion behaviour of five laboratory melted CuNi5 alloys, containing up to 4% fe in solution, was investigated. It turned out that their reciprocal polarisation resistance in the steady state situation is lower than those for the CuNi 10 Fe alloys.     

Corrosion behavior of newly developed Ti–Ag–Fe dental alloys in neutral saline solution

The corrosion behavior of Ti–5Ag–xFe alloys (x = 1, 2.5, 5 wt%) in neutral saline solution was investigated by the open‐circuit potential (OCP), potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and potentiostatic tests. The microstructural observation indicated that β‐Ti phase was retained by the addition of Fe into Ti–Ag alloys. Compared with commercially pure (CP) Ti, Ti–5Ag–xFe alloys exhibited higher corrosion potentials, lower current densities, and larger impedance, these suggested that Ti–5Ag–xFe alloys have nobler electrochemical corrosion behavior when compared with CP Ti in neutral saline solution.