测定钢板镀锌层质量的几种腐蚀液比较

化学溶解法是检验钢板镀锌层质量的一个主要手段。取不同的腐蚀液对镀锌层质量的影响进行了试验和对比。结果表明，选择盐酸-乙二胺（缓蚀剂）溶解锌层，锌层溶解后钢板表面光洁，所得结果的精确度令人满意。     

热镀锌钢板表面状况对漆膜性能的影响

热浸镀锌钢板表面粗糙度、无铬耐指纹钝化后锌层的均匀性及锌渣等表面状况直接影响着镀锌钢板漆膜层的各项性能;热浸镀锌钢板表面的粗糙度对钝化膜的性能有影响,进而影响耐指纹热镀锌钢板的涂漆附着力和耐蚀性能.采用SEM,EDS,EPMA等方法,对耐指纹热镀锌钢板进行分析,找出了漆膜性能与镀锌钢板表面粗糙度之间的关系,发现锌层的不...     

镀锌钢板点焊参数对熔核结晶形态的影响

分析和比较了普通冷轧钢板、电镀锌钢板和两种锌层厚度不同的热镀锌钢板在几种点焊参数下的熔核结晶形态。结果表明：镀锌层的存在对点焊熔核结晶形态很不利，增加焊接时间和焊接压力能使熔核结晶形态有所改善，但增加焊接电流会对其更不利。根据试验结果，对镀锌钢板点焊参数选择提出了建议。     

进口彩涂钢板失效分析

借助扫描电镜(SEM)和能谱分析(EDAX)等分析手段,对彩涂钢板镀锌层的均匀性、基板进行了研究.结果表明,本批彩涂钢板的基板存在镀锌不均以及锌层严重氧化等质量问题,是导致整批彩涂钢板发生表面油漆剥离,并造成部分钢卷加工成型的构件失效的主要原因.     

一种等效拉延筋阻力模型及其应用

 为了提高板料成形件质量,提出了一种等效拉延筋阻力模型.该拉延筋阻力模型在平面应变假设的前提下,考虑中性层偏移、鲍辛格效应等多种因素影响,通过与经典的Nine试验数据比较,证明了该模型的准确性.以翼子板为成形对象,结合改进的等效拉延筋阻力模型,采用非线性优化算法对拉延筋结构进行优化设计.利用优化获得的等效拉延筋阻力反求拉延筋几何参数,建立成形中的实体拉延筋仿真模型,获得了质量较好的成形件.研究结果表明该等效拉延筋阻力模型能够较好地适用于板料成形中.     

影响热浸镀锌钢板锌花形成的因素

使用低碳钢板进行热浸镀锌试验,利用扫描电镜观察了含铅镀锌层的微观形貌与组织,根据Zn-Pb相图,对含铅镀层的凝固过程进行了分析.通过试验研究了冷却速度对锌花大小的影响,当冷却速度在0～25 K/s时,随冷却速度增大,锌花尺寸从10 mm逐渐减小到1 mm,并分析其原因,得出:铅影响锌结晶过程和锌花形态,锌枝晶生长方向取决于形核位置,冷却速度对锌花尺寸有显著影响,锌花尺寸与冷却速度呈负指数增长的关系.     

热浸镀锌铝镁钢板镀层组织及腐蚀性能研究

锌铝镁镀层钢板比普通的镀锌钢板具有更加优异的耐腐蚀性能,本研究利用热镀锌模拟器在实验室制备了热浸镀锌铝镁合金镀层钢板,利用扫描电子显微镜SEM观察了镀层表面及截面的微观组织,利用能谱EDS进行了微区成分分析;利用电子探针EPMA对镀层的表面及截面进行了元素分布分析,利用盐雾试验方法对锌铝镁镀层钢板的耐腐蚀性能进行了研究,利用X射线衍射分析了镀层及镀层盐雾试验腐蚀产物的物相组成。结果表明,热浸镀锌铝镁镀层钢板比普通镀锌板具有更加细致的组织,镀层主要由MgZn2与含Al富锌相构成的共晶相和MgZn2组成,另外还存在一些粒状富铝相和块状富锌相,Zn-Al-Mg镀层比普通镀锌板具有更强的耐腐蚀性能,最后分析了锌铝镁镀层钢板的耐盐雾腐蚀机理。     

锌基涂层的电化学行为及防蚀机理

通过电极极化曲线测量和盐雾试验等方法，研究了热固型锌基铬酸盐转化支和电镀锌印化层在３．５％ＮａＣｌ中性性溶液中的电化学行为和防蚀性。     

镀锌钢丝锌层重量不确定度评定

根据不确定度的来源及产生原理，建立数学模型，对镀锌钢丝锌层重量的测定结果的不确定度进行了评定，与实际应用相吻合。所建数学模型及评定方法，对镀锌钢丝中锌层重量不确定度的评定具有很强的通用性。     

蒸发制备锌镁合金镀层中锌镁层的扩散研究

锌镁合金镀层是一种具有优异防腐蚀性能的新型钢板保护镀层,真空镀由于其优良的镀层性能正逐步发展为锌镁合金镀层的重要制备工艺。本文在镀锌钢板表面采用真空热蒸发镀镁,再由快速退火工艺形成锌镁合金镀层。通过X射线衍射、二次离子质谱和扫描电镜分析了在退火过程中锌、镁层的扩散过程,并通过盐雾试验和电化学测试研究扩散过程对锌镁合金镀层腐蚀性能的影响。研究发现:退火过程中镁快速向锌层扩散,并在锌层内一定深度处富集,而锌逐渐向镁层扩散,这种相互扩散形成了锌镁合金。同时铁也会向锌层扩散,形成锌铁合金。镁富集区具有扩散阻挡作用,阻止镁进一步向内扩散的同时也阻止铁向表面的扩散。腐蚀性能测试表明,370℃下退火60～120 s的样品具有较好防腐蚀性能。     

MODIFICATION OF THE COMPOSITION OF LASER WELDS IN ELECTROGALVANIZED STEEL AND THE EFFECT ON CORROSION PROPERTIES

Compositional modification of the weld metal during laser welding of electrogalvanized steel sheet was achieved by the injection of metal powder or by a technique in which zinc that had been volatilized as a result of the welding operation was redeposited on the weld bead. Corrosion testing by means of the linear polarization technique showed that the coating corrosion rate in the case of laser welds containing redeposited zinc was substantially lower for an initial period than for normal laser welds. Only a small decrease in corrosion rate was achieved by the injection of tool steel powder during laser welding while an increase in coating corrosion rate was produced by the injection of nickel powder or stainless steel powder     

Inhibition of corrosion by a mixture of nonchromate pigments in organic coatings on galvanized steel

We consider several possible substitutes for toxic chromate pigments. Among the most promising compositions for the corrosion inhibition of galvanized steel with a protective organic coating, we should mention a mixture of phosphate- and calcium-containing pigments. As was shown earlier, such a mixture possesses a high efficiency under conditions of the corrosion of zinc and galvanized steel sheet; however, it is less efficient for the protection of carbon steels. This pigment mixture forms an adsorbed phosphate film on the metal and hinders the course of anodic and cathodic reactions. Zinc ions play an important role for obtaining a synergistic protective effect, increasing the coherence and decreasing the porosity of the deposited film. Traditional and local electrochemical methods (EIS and SVE) were used for studying the corrosion of galvanized steel with coatings in acid rain solution. The data obtained corroborated the high anticorrosive efficiency of a pigment mixture in an organic coating on galvanized steel. In addition, we established some specific features of its inhibiting action near defects in the coating.Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 40, No. 3, pp. 74–80, May–June, 2004.     

镀锌层上单宁酸钝化膜的耐腐蚀性能

为提高镀锌板的耐蚀性,以硝酸、氟化铵、氧氯化锆为辅助成分,配制了单宁酸钝化液,并用其对镀锌板进行钝化处理。通过浸泡试验确定了最佳钝化工艺,通过扫描电镜（SEM）、Tafel曲线和交流阻抗谱研究了不同条件制备的钝化膜的形貌、耐蚀性。结果表明：镀锌层经1mol／L氢氧化钾溶液于65℃活化30s后再在含10g／L氧氯化锆的钝...     

锌层对热镀锌钢板成形性的影响

测试了热镀锌钢板的力学性能和模拟成形性能,用扫描电镜观察试样拉伸变形后表面镀层变化情况,分析讨论了锌层对成形性的影响。结果表明：锌层产生横向裂纹是影响热镀锌钢板成形性的主要原因,锌层对r值有一定的影响,锌层厚度越大,r值降低的幅度越大。热镀锌钢板的扩孔率比冷轧裸板的扩孔率低10％～20％;FLC值降低5％左右（绝对值）。     

陶瓷转化工艺在空调镀锌钢板涂装中的应用

介绍一种新型陶瓷转化工艺在空调镀锌钢板的粉末喷涂中的应用.通过转化膜的晶相、附着力及盐雾试验表征,对预转化板的现有工艺进行控制.盐雾试验结果表明,预转化镀锌钢板经过弱碱性脱脂剂清洗,经陶瓷转化后与粉末涂料结合,可以得到良好耐蚀性和附着力强的膜层.     

Modeling the mechanical behavior of a multicrystalline zinc coating on a hot-dip galvanized steel sheet

Numerical simulations can play a major role in the understanding of deformation mechanisms in zinc coatings of galvanized steel sheets during forming processes. A three-dimensional finite element (FE) simulation of a thin zinc coating on a galvanized steel sheet has been performed taking the multicrystalline structure of the coating into account. Experimental characterization of the gauge length of a real in situ tensile specimen reveals 34 large flat zinc grains; the grain orientations are determined using the electron back-scatter diffraction (EBSD) technique. The geometry and orientation of the grains and the plastic deformation modes specific to hexagonal close-packed (hcp) metals as plastic slip and twinning are incorporated into the modeling using a classical crystal plasticity framework. The constraint effect of the substrate is evidenced by comparing the results to the computation of a zinc layer without substrate under the same loading conditions. Attention is then focused on, respectively, the initiation of plastic activity at the grain boundaries, the multiaxial stress state of the grains, the development of a strain gradient within the thickness.     

金属阳极涂层在化工大气环境中的腐蚀行为

为了解化工大气环境对碳钢表面金属阳极涂层的腐蚀性,开展了热喷涂锌、铝、锌铝合金涂层以及热镀锌、渗锌钢在化工大气环境中的曝露腐蚀试验。通过试样的腐蚀形貌、腐蚀速率变化及电化学测试,考察了金属阳极涂层在石油炼化大气环境中的腐蚀行为。结果表明:化工大气环境腐蚀等级为C4级;喷铝层的腐蚀速率最低;渗锌层的耐蚀性优于热镀锌层。10μm厚热镀锌板耐腐蚀寿命约为4 a,40μm厚热镀锌和渗锌层寿命大于10 a,150μm的喷涂层耐蚀寿命大于30 a。     

胶质磷酸钛表调预处理对热镀锌层表面磷化膜的影响

通过扫描电镜(SEM)分析、磷化膜增重和开路电位-磷化时间的测量及中性盐雾(NSS)试验,研究了胶质磷酸钛表调预处理对热镀锌层表面磷酸锌转化膜的影响.结果表明,热镀锌钢经胶质磷酸钛表调预处理后再磷化,与不经表调直接磷化相比,磷酸锌晶体的形核率与生长速率明显提高,可获得较细小致密的磷酸锌晶体和较大的膜层增重;且前者由于磷酸锌晶体细化和覆盖率提高,磷化膜的耐蚀性也有所增强.     

Dissimilar joining of galvanized high-strength steel to aluminum alloy in a zero-gap lap joint configuration by two-pass laser welding

A welding procedure based on using two-pass laser scans is introduced for dissimilar joining of overlapped galvanized high-strength dual-phase (DP) steel DP590 to aluminum alloy (AA) 6061 sheets. The first pass is based on a defocused laser spot that scans across the top of the two overlapped sheets and heats the zinc coating at the faying surface to be melted and partially vaporized, while the second pass is executed with a focused laser spot in order to perform the welding. Completely defect-free galvanized steel to aluminum lap joints were obtained by using this two-pass laser welding procedure. An on-line machine vision system was applied to monitor the keyhole dynamics during the laser welding process. An energy-dispersive X-ray spectroscopy (EDS) was carried out to determine the atomic percent of zinc, aluminum, and iron in the galvanized steel to aluminum lap joints. Mechanical testing and micro-hardness test were conducted to evaluate the mechanical properties of the galvanized steel to aluminum lap joints. The experimental results showed that the lap joint of galvanized steel to aluminum obtained by the two-pass laser welding approach had a higher failure value than those joints obtained when the zinc at the faying surface was mechanically removed under the same welding speed and laser power.     

Electrochemical Behavior of Organic Film With Nano Silica

Organic-inorganic composite films were prepared by adding different amount of nano-SiO2into water soluble acrylic resin (AC) on hot-dip galvanized steel sheet. The electrochemical behavior of nano SiO2 modified acrylic resin films in 5 % NaCl solution were studied by electrochemical measurement techniques. Results indicate when there are 8% ～ 12% SiO2 in organic film, it can shows an analogous passivation propertyin anodic polarization curves, increase anodic polarization function of galvanized coating, retarde lectrode reaction more efficiently. The reason is that either SiO2 in organic film occur chemical reaction with Zn, produce stable zinc silicate compound; or as aresult of dissolve-redeposit of SiO2 in the film.