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双语推荐：耐腐蚀层

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为了提高SUS 304不锈钢表面的耐磨损、耐腐蚀性能,采用激光表面合金化的方法制备了Cr-CrB2层,并进行了理论分析和实验验证,取得了合金化层的组织和物相以及电化学腐蚀性数据。结果表明,合金化层组织致密、晶粒细小,与基体形成冶金结合,合金化层由奥氏体、马氏体、铁铬固溶体、碳化物和铬硼化合物组成;合金化层的耐蚀性得到提高,腐蚀速率降低,合金化层的极化曲线具有较长的活化-钝化区间;不锈钢基体发生严重的晶界腐蚀和点蚀,晶界腐蚀以孪晶晶界腐蚀为主,合金化层表面发生晶粒间的晶界腐蚀,伴有晶粒和晶界处的点蚀现象,点蚀坑明显小于基体表面的点蚀坑。这一结果对提高SUS 304不锈钢表面的耐磨损、耐腐蚀性是有帮助的。
In order to improve the wear and corrosion resistance of SUS 304 stainless steel , an alloyed layer of Cr-CrB2 was fabricated on SUS 304 stainless steel using laser surface alloying .The datum about microstructure , phases and the corrosion property of the alloyed layer were obtained .Dense and homogeneous structure and fine grains were observed in the alloyed layer .A metallurgical bonding interface was formed between the alloyed layer and the substrate .The alloyed layer consists of austenite , martensite, Fe-Cr, chromium carbide and chromium boride .The alloyed layer shows higher corrosion resistance and lower corrosion rate than the substrate .The polarization curve of the alloyed layer has a long activaton-passivation segment .Intergranular corrosion and pitting in the grains and the grain boundaries are observed for substrate , and intergranular corrosion occurs mainly in the boundary .The alloyed layer shows intergranular corrosion in combination with pitting in the grains and g

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为了提高碳钢铸造阀体内部的耐腐蚀性能,需要在其内表面堆焊耐腐蚀层。对DN500阀体进行三维实体建模,估算出阀体质量及内表面积。设计了阀体内表面的堆焊工艺,通过堆焊厚度和内表面积估算出焊条用量,又设计了阀体配合面的堆焊与加工工艺,对加工尺寸链进行计算,既保证了配合精度,又保证了耐腐蚀层的厚度。结果表明,通过对大型阀门的三维建模,估算制造成本的方法是可行的并具有实际工程意义;配合表面的堆焊与加工工艺能够在保证耐腐蚀层厚度的基础上达到配合要求;采用普通铸钢并堆焊耐腐蚀层制造的阀体,比全不锈钢阀体成本可降低30%以上。
The corrosion resistance layers can be surfaced in the valve casted by carbon steel , to enhance the corrosion resistance performance. By the 3D solid model, the weight and internal area of valve body was obtained. The surfacing process was designed and the welding rods theory amount was calculated through welding thickness and internal area. The surfacing and cutting process was designed for the fit surfaces and the dimension chain was calculated to meet the fit accuracy and the corrosion resistance layer thickness. The results showed that it has the engineering significance by using 3D solid model to estimate the producing costs; the fit accuracy and the corrosion resistance layer thickness can be obtained together based on the surfacing and cutting process; in this way, the cost can be cut down more than 30%, compared the whole stainless steel valve.

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本文通过阳极腐蚀、阴极极化和交流阻抗的实验研究了银对铅钙合金腐蚀行为的影响。实验结果表明,银可以显著提高铅钙锡铝四元合金的耐腐蚀性能、析氢过电位和腐蚀层的导电性能。
This paper studied the inlfuences of silver on the corrosion behavior of lead-calcium alloy by the experiment of anode corrosion, cathode polarization and electrochemical impedance spectroscopy. The results showed that silver can signiifcantly improve the corrosion resistance, hydrogen evolution overpotential of lead-calcium-tin-aluminum alloy and the conductivity of corrosion layer.

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利用锈层稳定化处理的耐候钢焊接接头,进行了大气曝晒(喷淋)加速试验,结果证明:经表面复合处理剂处理后的Q450NQR1耐候钢,腐蚀率显著降低,不仅提高了耐蚀性,而且也提高了抗局部腐蚀能力。经表面复合处理剂处理的焊接接头与非焊接样的腐蚀试验结果没有差别,说明表面复合处理剂适用于焊接接头的锈层稳定化处理。
The atmospheric exposure (spray) accelerated test was conducted by the rust layer stabili-zing treatment of weathering steel welding joint .The results show that the corrosion rate of weathering steel Q450NQR1 is significantly reduced by the surface composite treatment agent ,and that the steel can not only improve the corrosion resistance ,but also help to increase the resistance to local corrosion .The corrosion test results of welding joint with surface composite treatment agent and non-welding sample did not differ ,which revealed that the agent applies to the rust layer stabilization treatment of the welding joint .

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目的：探究超声波功率对镀层耐腐蚀性的影响规律。方法将超声波功率分为50,70,90,110 W4个等级,利用湿法超声机械镀锌设备制备4种镀层。用多功能扫描电子显微镜观察镀锌层的微观表面形貌,并分析镀锌层厚度,测试镀锌层的耐腐蚀性能以及镀层与基体的附着强度。结果功率为50 W时获得的镀层厚度最大,表面质量、耐腐蚀性能最差；功率为110 W时获得镀层表面质量、耐腐蚀性能最好。结论随功率的增大,镀层表面质量明显提高,镀层耐腐蚀性有逐渐增加的趋势。
ABSTRACT:Objective To explore the influencing law of the ultrasonic power on the corrosion resistance of the coating. Methods Under the four levels of ultrasonic power(50, 70, 90, 110 W),four kinds of mechanical zinc-coatings were prepared by Wet ultra-sound mechanical galvanizing equipment. The surface topography of the coatings was observed and studied by SEM. The coatings thickness was measured, the corrosion resistance was determined and the bonding strength between the coating and the substrate was studied. Results When the ultrasonic power was 50 W, the corrosion resistance and surface quality of the zinc-coating were worse than those of others. While the corrosion resistance and surface quality of the zinc-coating were the best when the ultrasonic power was 110 W. Conclusion The surface quality of the coating was significantly improved and the corrosion resistance of the coating showed an increasing trend with increasing power.

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目的：提高AZ91 D镁合金的耐腐蚀性能,扩大其应用范围。方法先在AZ91 D镁合金表面化学镀Ni-P镀层,再化学镀Ni-Sn-P镀层,形成Ni-P/Ni-Sn-P双镀层。研究Ni-P/Ni-Sn-P双镀层的表面形貌和耐腐蚀性能,并与Ni-P单镀层进行对比。结果 Ni-P/Ni-Sn-P双镀层表面分布更均匀平整,缺陷较少,孔隙率较低,具有无定形结构。二次Ni-Sn-P镀层的腐蚀电位约为-0.77 V,略低于一次化学镀Ni-P层(约-0.68 V),两镀层间的电位差使得其构成了微腐蚀电偶,Ni-P层作为阴极,Ni-Sn-P层作为阳极,阳极优先被腐蚀。结论 Ni-P/Ni-Sn-P双镀层的Ni-Sn-P外层能为Ni-P内层提供阴极保护,较好地横向分散腐蚀电流,从而增强AZ91 D镁合金基底的耐腐蚀性能。
ABSTRACT:Objective To improve the corrosion resistance of AZ91D magnesium alloy and expand the range of application. Methods Ni-P coating was first prepared on AZ91D magnesium alloy by electroless plating, then Ni-Sn-P coating was prepared on this basis, forming Ni-P/Ni-Sn-P duplex coatings. The microstructure and corrosion resistance of Ni-P/Ni-Sn-P duplex coatings were investigated and compared with those of Ni-P coating. Results The results showed that the surface of Ni-P/Ni-Sn-P duplex coatings was more uniform, compact, with fewer defects, lower porosity and amorphous structure. The corrosion potential of the secondary Ni-Sn-P coating was about -0. 77 V, which was lower than that of the first Ni-P coating (-0. 68 V). The potential difference between the two coatings formed micro etching point, with Ni-P coating as the cathode, and Ni-Sn-P coating as the an-ode, and the anode was corroded first. Conclusion The outer layer of Ni-Sn-P coating in the Ni-P/Ni-Sn-P duplex coat

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目的研究Q235钢和耐候钢在3.5%(质量分数)NaCl盐雾/干燥循环加速腐蚀试验中的腐蚀过程,比较它们的耐腐蚀性。方法采用腐蚀失重分析、X-射线衍射分析、扫描电镜观测和电化学测试等进行研究。结果 Q235钢和耐候钢的锈层没有明显的保护作用,但耐候钢的耐蚀性略优于Q235钢。结论在模拟海洋大气环境中,该耐候钢没有优越性,说明该耐候钢不适用于海洋大气环境中。
Objective To study the corrosion process of Q235 steel and weathering steel in 3.5% NaCl cyclic salt spray/dry accelerated corrosion experiment and to compare their corrosion resistance. Methods Weight-loss method, XRD,SEM and electrochemical test. Results The rust layer of Q235 steel and weathering steel had no significant protective effect,but the weather resistance of weathering steel was slightly better than that of Q235 steel. Conclusion In simulated Marine atmospheric environment,the weathering steel had no superiority. The weathering steel is not applicable to marine atmospheric environment.

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采用电化学性能测试、半浸泡试验及SEM、EDS分析研究了铬含量对薄壁高强度桩管钢耐腐蚀性能的影响。结果表明,试样在3.5%盐溶液中一直处于活化状态;随着铬含量增加,薄壁高强度桩管钢试样自腐蚀电位相差不大,但腐蚀电流密度降低,电荷转移电阻增大;试样在盐溶液-大气界面处腐蚀最为剧烈。随着铬含量的增加,钢的耐蚀性不断提高,当铬质量分数为2%时,试样耐蚀性最好,年腐蚀速率为0.023 4mm/a。铬元素在锈层中出现富集现象,但在液-气界面区和浸泡区表现出不同的特征:铬元素在浸泡区富集于与基体接触的内锈层区,而在液-气界面区富集于远离基体的外锈层区。
Effects of Cr on corrosion behavior of thin-wall high strength pile pipe steels were studied with electrochemical test,half-immersion,SEM and EDS.The results showed that the specimens were activated in 3.5%NaCl solution,the corrosion current density reduced with the increase of Cr while the charge transfer resistance increased.The most serious corrosion area of thin-wall high strength pile pipe steel specimens in half-immersion tests was the interface between NaCl solution and air.Corrosion resistance of the specimens was improved with the increase of Cr content.The specimen with 2% Cr had the best corrosion resistance,and the corrosion rate was 0.0234mm/a. Cr element was enriched in the rust layer in different ways at the immersion area and the interface area between NaCl solution and air.Cr was enriched in the inner area of rust layer contacting with the substrate at the immersion area, while enriched in the outer area of rust layer at the interface area between NaCl soluti

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为提高ZK60镁合金的耐腐蚀性能，对其表面化学镀镍工艺进行研究。用扫描电镜（SEM）、能谱仪（EDS）和X射线衍射仪（XRD）研究预处理层和镀镍层的形貌、成分及镀层结构。镀层的耐蚀性能通过极化曲线测试分析。研究结果表明：在镀镍过程中，Ni-P镀层优先在酸洗产生的腐蚀坑处形核；镀镍1 h后可获得均匀致密、无明显缺陷的非晶态Ni-P镀层，镀层厚为17.64μm，磷的质量分数达12.32%；在质量分数为3.5%NaCl溶液中，镀层的自腐蚀电位为-0.43 V，腐蚀电流密度约为基体的1/20，具有良好的耐腐蚀性能。
In order to improve the corrosion resistance of ZK60 magnesium alloy,electroless nickel plating on ZK60 magnesium alloy was investigated. The morphology and composition of pretreatment coating and electroless nickel coating were studied by scanning electronic microscopy(SEM)and energy dispersive spectroscopy(EDS). The structure of nickel coating was studied by X?ray diffraction spectroscopy(XRD).Potentiodynamic polarization analysis was used to analyse the corrosion resistance of the coating. The results indicate that the Ni?P nucleates preferentially in micropores created during acid picking process. The subsequent amorphous electroless nickel coating is uniform and the thickness is 17.64 μm after l h deposition. Phosphorus mass fraction is 12.32. The corrosion potential is-0.43 V and the corrosion current density is about 1/20 of substrate in 3.5%NaCl solution.

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为了提高镁合金耐腐蚀性能,采用正交试验对镁合金环保型阳极氧化电解液进行优化,确定了最佳的电解液组成,并通过全浸试验和动电位极化曲线等检测手段研究膜层的耐腐蚀性能.结果表明:镁合金经组成为50g/L氢氧化钠、100 g/L硼酸钠、20 g/L硅酸钠的电解液氧化后,表面生成的氧化膜光滑、平整、致密性好,腐蚀电位提高75 mV左右,耐腐蚀性能提高45%左右,对镁合金基体有良好的防护性.
To improve the corrosion resistance of magnesium alloys,Orthogonal test was used to optimize research for Friendly An-odized electrolyte of the magnesium alloys,and the analysis of the corrosion resistance of the oxide film obtained by optimization also have done. The corrosion rate of oxide film was used as the main evaluation index to determine the optimum composition of electrolyte, and the corrosion resistance of the film was studied through total immersion test and potentiodynamic polarization curve,and so on . The research results show that,under normal temperature,the concentration of sodium hydroxide,sodium borate,sodium silicate,so-dium carbonate are 50 g/L,100 g/L,20 g/L,and the anodized film prepared in the optimized electrolyte was smooth and compact. The corrosion potential and corrosion resistance increase about 75 mV and 45%,which can well protect the magnesium.

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