腐蚀论文.docx

1、腐蚀论文Influence of corrosion on the interface between zinc phosphate steel fiber and cement磷酸锌钢纤维和水泥的界面处对腐蚀的影响1 M. Sun1,2,*,2 D.-J. Wen1,3 H.-W. Wang1Article first published online: 16 AUG 2010DOI: 10.1002/maco.200905580Copyright 2012 WILEY-VCH Verlag GmbH & Co. KGaA, WeinheimCopyright 2012 WILEY-VCH

2、Verlag GmbH & Co. KGaA, WeinheimKeywords:corrosion;interface bond;steel fiber;zinc phosphateAbstractThe interface bond between steel fibers and concrete matrix is a key factor influencing bearing capacity of steel fiber reinforced concrete (SFRC). In order to improve the interface bond strength and

3、corrosion resistance, a kind of method was put forward by depositing zinc phosphate (ZnPh) coating on steel fiber surface in this paper. The corrosion behavior was investigated in 5% NaCl solution by using linear polarization measurement. Microstructure analysis (SEM and EDX) and fiber pull-out test

4、 in combination with linear polarization measurement were carried out. The results prove that ZnPh coatings fabricated on the carbon steel surface can not only protect steel fiber against corrosion, but also enhance the mechanical interlocking bonds between fibers and matrix.摘要：在钢纤维和混凝土基体之间的接触面粘结是对关

5、于加强钢纤维混凝土承受能力的主要影响。为了提高界面粘结剂的作用和防止腐蚀，本文中提到的一种方法是在钢纤维上电镀磷酸锌。腐蚀反应的研究是通过在5%NaCl中用线性极化测量的。显微结构分析和纤维拉长测试在和线性极化测量方面的结合已经实施。结果证明磷酸锌涂层组合在碳棒钢铁表面不仅仅保护钢纤维防腐蚀而且会加强纤维和基质的机械连锁。1 IntroductionMixing fibers with concrete is one of the most effective ways to improve and enhance concrete strength and toughness. In pra

6、ctical engineering, glass fiber, polypropylene fiber, carbon steel fiber, and stainless steel fibers were commonly used. Carbon steel fiber (hereinafter referred to as “steel fiber”) with low-cost, high elastic modulus, is more suitable for load-bearing structure. In its practical application, in or

7、der to give full play to the role of steel fibers and ensure the bearing capacity of steel fiber reinforced concrete (SFRC钢纤维混凝土) under erosive environment (such as marine tidal fluctuation zone and splashed area), the corrosion resistance of steel fibers and the bond strength between steel fibers a

8、nd concrete matrix need to be further enhanced. 1, 2简介纤维混凝土混合物是提高加强混凝土强度和硬度的最有效方法之一。在实际工程中，玻璃纤维，丙纶纤维，碳钢纤维，以及不锈钢纤维都得到广泛应用。具有低成本，高弹性的碳钢纤维用作建筑物的承载更加合适。在碳钢纤维的实际应用中，在腐蚀环境（如海洋中潮汐涨落曲和飞溅区）下，为了充分发挥钢纤维的作用和确保钢纤维混凝土的承载能力，钢纤维的抗腐蚀能力和钢纤维与混凝土之间的粘结强度需要进一步提高。The present research results show that when SFRC is damaged

9、 resulting from the external load, a lot of steel fibers on the fracture surface will be pulled out and not snapped. The efficiency of steel fiber will be very low because the pull-out stress is far below than the yield strength of the steel fiber, and this will greatly affect the bearing capacity o

10、f SFRC. 3, 4目前的研究结果表明，当钢纤维混凝土由于外加载荷受到损坏时，在断裂表面上的许多钢纤维将会被拉出但不会拉断。由于拉应力远远低于屈服强度，钢纤维的效率将会变得很低，这将会对钢纤维混凝土的承受能力产生极大影响。The engineering practice and application research also show that if SFRC works under severe corrosion environment (such as marine tidal fluctuation zone and splashed area), or has some cr

11、acks because of loads or other factors, the corrosion phenomenon of steel fiber will emerge. Once corroded, the volume of steel fiber would increase two to three times and bring considerable expansion pressure to the concrete, which may lead to the matrix cracking of concrete. The action of carbonat

12、ion and salt water will result in or accelerate the corrosion of steel fiber in the cracked SFRC. The corrosion of steels will further reduce or destroy the bonding strength between the fibers and concrete, and reduce the bearing capacity and deformation properties of SFRC component. 5, 6工程测试和应用研究都表

13、明如果钢纤维混凝土在强烈的腐蚀环境下工作，或者在由于载荷或其它因素的撞击条件下，钢纤维的体积会膨大二到三倍而且会对混凝土带来相当大的膨胀压力，这将会导致混凝土破裂。在钢纤维混凝土破裂过程中，碳酸物和盐水的作用会导致或加速钢纤维的腐蚀。而钢纤维的腐蚀又会使钢纤维和混凝土之间的粘结强度进一步减少或毁坏，也会减少钢纤维混凝土组件的承受能力和产生形变。How to improve anti-corrosion properties of steel fiber and ensure good adhesion between steel fiber and matrix are the current

14、 pressing issues. In this paper, we attempted to resolve these problems by depositing zinc on the steel fiber surface. Zinc and magnesium phosphate treatment methods have been reported by Sugama, Sommer and Leidheiser, and Morks79. According to their research results, ZnPh coating can provide consid

15、erable protection of steel fiber against the corrosive attack. Compared with their research work, the study in this paper particularly focuses on the influence of corrosion on the interface between steel fiber and cement and the bearing capacity of SFRC. The microstructure of as-received （应用基）fiber

16、and zinc phosphate (ZnPh)-treated fiber by scanning electron microscopy was investigated. Electrochemical corrosion tests of these fibers were carried out respectively. In order to investigate the adherence of the bond strength at fibercement interfaces, pull-out load of fiber-cement was measured.怎样

17、提高钢纤维的抗腐蚀性和确保钢纤维和基体之间的高粘度是目前的紧急问题。在本论文中，我们通过在钢纤维表面镀锌来尝试解决这些问题。处理磷酸锌和磷酸镁的方法已经被报道。根据他们的研究成果，磷酸锌涂层可以对钢纤维抗腐蚀破坏提供相当大的保护。和他们的研究成果相比，这篇论文着重研究钢纤维，水泥的界面处腐蚀影响以及钢纤维混凝土的承载能力。通过扫描电镜的观察对应用基纤维和磷酸锌处理纤维进行了研究。这些纤维的电化学腐蚀测试是分别进行的。为了探讨纤维水泥界面强度的依附，对纤维水泥的拉应力进行了测量。2 Experimental details2 实验细节2.1 Materials 实验材料The wave-shap

18、ed fibers used in study have a circular-section with the diameter of 0.66mm and the length of 31mm, produced by Yixing Kunwi Metal Fiber Company. Its chemical composition is shown in Table 1.在研究中使用波浪状的纤维，0.66mm的直径的圆截面，长31mm，由Yixing Kunwi 金属纤维公司生产。它的化学成分如表1.Table 1.Composition of steel fibersNumber o

19、f batchChemical composition (%)CSIMnPSO6L1-169020.120.160.370.0230.018Acetone was used to wipe the steel fiber surface to remove any surface contaminants, and then the surface-cleaned steel fibers were immersed into the ZnPh solution for a period of time. After immersion, the fiber surface was rinse

20、d with deionized water, and then dried to remove any moisture. Subsequently, protective film layer of ZnPh can be deposited on the surface of the steel fiber. ZnPh deposits have inorganic crystal structure, which can improve the bonding strength and the anti-corrosion ability of carbon steel fibers.

21、为出去表面污物钢纤维用丙酮擦拭，然后表面净化的钢纤维在磷酸锌溶液中浸泡一段时间。浸泡后，用去离子水冲洗纤维表面，然后弄干所有水分。随后，在钢纤维表面涂上磷酸锌保护膜。磷酸锌涂层是无机晶体结构，它可以改善界面强度和碳钢纤维的抗腐蚀能力。The immersion duration and the temperature were set up at 25min and 90C, respectively.Pull-out test specimens were prepared according to rules 10. As-received steel fibers, ZnPh steel

22、 fibers, 425 ordinary Portland cement, standard sand of 2.5g/cm3 fineness modulus were used. The mixing ratio is shown in Table 2.浸泡时间为25分钟，温度为90摄氏度。拉力实验试样的准备按照规则10.应用基钢纤维，ZnPh钢纤维，425普通硅酸盐水泥，标准砂2.5克/厘米3细度模数。表2所示的混合比例Table 2.Test materials mixing ratioCement (kg/m3)Water (kg/m3)Sand (kg/m3)WaterCemen

23、t ratioLimesand ratio180903600.50.5The cement and sand were firstly mixed without water, and then mixed with water completely. The cement mixture was put into the test mold with the shape like “8” (Fig. 1), then a 2.0mm-thick plastic clapboard was inserted in the central section. The clapboard has f

24、our poles with equal distance of 15mm to fix fibers and keep the fibers straight. Fibers were fixed by the clapboard, and were embedded in the middle of the cement mixture, as shown in Fig. 1. The test mold was put onto the vibration platform to vibrate completely.首先水泥和沙子在没有水的情况下混合，然后完全和水混合。在水泥混合物中插

25、入形状像8（图1）的测试模具，然后把一个厚度为2.0mm的塑料隔板插在中间截面处。隔板距混合纤维有15mm等距的四个电极，以使纤维保持笔直。通过隔板纤维被混合并且嵌入水泥混合物的中间，如图1所示。将测试模具放在振动台上使其完全振动。Figure 1.Test mold shape and size (cm).2.2 Measurements 测量In order to determine the fibers anti-corrosion capability in marine area, NaCl solutions was used to simulate the sea water i

26、n the test. The ZnPh-treated steel fibers and untreated fibers were separately put into two equal cups of 5% NaCl solutions at a temperature of 25C. The absorbance values of the two solutions were measured by spectrophotometry after a period of time.为了确定纤维在海水中的防腐蚀能力，在实验中用 NaCl溶液模仿海水。磷酸锌处理的纤维和未经任何处理的

27、纤维分别在25摄氏度下放入两份同样的5% NaCl溶液烧杯中。一段时间后，用分光光度法测定两种溶液的吸收值。In order to simulate fibers corrosion behavior in marine area for long time, the linear polarization test was carried out on two kinds of fibers respectively with CHI660C electrochemical workstation (produced by Shanghai Chen Hua Instrument Compa

28、ny). Each fiber was covered by epoxy colophony while setting the place of 3.5mm2 aside as working area. The reference electrode was a saturated calomel electrode and the auxiliary electrode was a nickel plate with an obvious larger area than the working electrode area. The scanning voltage was 2 to

29、2V, and scanning rate was 0.01V/S.为了模拟长时间下纤维在海水中的腐蚀行为，两种纤维分别进行线性极化测试用CHI660C电化学工作站。每一个纤维都用环氧树脂覆盖，在旁边留出3.5mm2 作为 工作区。参考电极为饱和甘汞电极，辅助电极是比工作电极明显大的镍板。扫描电压为-22V，扫描速度为0.01V/S.Scanning electron microscope (SEM) associated with energy-dispersion X-ray (EDX) spectrometry was used to observe the microstructure

30、 of the as-received steel fiber and ZnPh-treated steel fiber before and after corrosion in 5% NaCl solution for 24h respectively.用有能量色散X射线的扫描电子显微镜来观察用5% NaCl 溶液腐蚀24小时前后的应用基钢纤维和磷酸锌处理的钢纤维Pull-out tests were carried out on the CSS2202 electronic testing machine with a loading speed of 0.5mm/min. The fi

31、ber pull-out loads, which depend on bonds between fiber and cement mortar, were measured.在CSS2202电子测试机上以0.5mm/min的加载速度进行拉伸实验。测量纤维拉伸载荷取决于纤维与水泥砂浆的禁锢。3 Results and discussion结果与讨论3.1 The corrosion test of steel fibers钢纤维的腐蚀实验The absorbance values of two solutions changed during the immersion duration w

32、hich were shown in Fig. 2.Figure 2.Absorbance change in 5% NaCl solution with fibers corrosion; (a) as-received fiber, (b) ZnPh-treated fiber.The original solution was clear, and its absorbance was near zero. When the rust products in the solution increase, the solution will become muddy and its absorbance will become bigger. So the quantity of rust products in each solution can be investigated through the change of absorbance.With the increase in soaking time, the solution of