常温固化氟碳涂料防腐涂层配套体系及施工质量控制（二）

介绍了氟碳涂料施工工艺和质量控制要点.指出表面处理是施工工艺过程控制的首要环节;喷射清理是最有效的除锈方式;磨料品质,表面油污和可溶性盐分的清理,喷砂后表面灰尘清洁度的控制以及喷砂前的结构预处理是不可疏忽的环节;涂装工艺过程控制主要考虑适宜的涂装环境条件,涂料的正确混合和使用,喷涂工艺参数选择和预涂装等;涂层质量检测主要包括漆膜外观、涂层厚度及附着力等.     

铝卷材辊涂及其生产工艺

介绍了铝卷材辊涂涂装的生产工艺.对铝卷材涂装生产线机列运行速度、二辊涂装和三辊涂装、涂层的厚度控制及烘烤固化和冷却方式等进行了介绍和比较;并对铝卷材辊涂技术提出采用喷淋、快干水溶性涂料、低温脱脂、无漂洗的方法及自动控制生产线是今后涂装工艺发展方向.     

铝合金地铁车辆涂装工艺及其管理

对铝合金地铁蒙皮、底架、车体内部、车顶受电弓等部位的涂层体系设计进行了概括,介绍了铝合金车体蒙皮涂装工艺流程和工艺参数:表面处理粗糙度(Ra)5.0～12.5μm,底漆干膜厚度≥60μm,腻子层总厚度小于2 mm,中涂层闪干时间约10 min、干膜平均厚度≥30μm,面漆干膜厚度≥40μm。从设备、工艺、人员、施工现场、质量控制、成本控制等方面对涂装管理进行了阐述。     

雨刮器氯丁橡胶胶条的涂装工艺及涂层厚度对其性能的影响

介绍了用于汽车雨刮器的氯丁橡胶(CR)胶条的表面处理和喷涂生产工艺,探讨了涂装工艺参数以及涂层厚度对涂层性能及刮净度的影响,并说明了关键控制要素。     

导读

涂装工艺是实现涂装质量的重要保证,本期针对涂装工艺进行重点报道。杨学岩等的"三涂层珠光漆的工艺调试及色差控制"主要介绍了汽车涂料三涂层珠光漆生产调试过程中出现的色差问题,并简要分析了问题产生的原因及其解决办法。指出三涂层珠光漆的调试和生产是一个复杂的过程,需要从人、机、料、法、环等多方面进行控制和管理,才能确保三涂层珠光漆色差等漆膜性能的稳定。李鹏等的"汽车涂装涂膜固化工艺"指出涂膜固化工艺是涂装工艺的重要工序之一,烘烤质量的好坏直接影响漆膜的质量,以奇瑞汽车股份     

PCCP表面有机涂层涂装质量检测技术

通过分析PCCP外壁有机涂层涂装质量控制指标的作用,介绍了PCCP外壁有机涂层的外观、厚度、附着力、漏点的检验方法。     

钢板表面质量对汽车2C1B涂装工艺的影响

汽车涂装中两涂一烘(2C1B)工艺的引进,使得涂装工序减少,涂层厚度降低,相比传统三涂两烘工艺(3C2B),2C1B工艺形成的涂层对表面缺陷的遮盖能力降低。通过模拟涂装试验,研究2C1B工艺的涂层对钢板表面积瘤、划伤类缺陷的遮盖能力,结果表明:积瘤类缺陷不能被涂装工艺覆盖,必须通过人工打磨后才能进入涂装工序,而轻微短线类缺陷部位深度在15μm内基本可以被涂装工艺所覆盖。带钢表面波纹度对涂装性能影响表明:只有Wca≤0.5μm的热镀锌外板产品才能满足汽车厂家的要求。     

涂层耐紫外线穿透性能测试方法及影响因素分析

涂层耐紫外线穿透性能测试在紧凑型涂装工艺(包括水性单涂层及其他3C1B工艺等)应用过程中,对涂装材料的开发和生产过程的质量控制至关重要。详细介绍了涂层耐紫外线穿透性能的测试方法,并围绕该方法的主要影响因素进行了大量试验分析及验证,提出了控制要求。     

未雨绸缪，积极应对IMO涂装新标准

从表面处理方式及要求、表面盐分限制、表面灰尘限制、涂层厚度及控制、涂层寿命等方面讨论了应对IMO涂装新标准的方法.     

施工工艺

环氧树脂阳离子电沉积施工方法及涂膜厚度的控制方法;得到优异的汽车安全标准（MVSS）级附着力的涂层体系;萘钠对氟树脂涂层的表面处理方法;木器表面静电喷涂工艺;光学塑料底材的涂装方法;使用喷涂剂确定用以控制涂料喷涂设备喷涂参数的方法     

三价铬镀液电镀铬的工艺研究

研究了一种环保型的三价铬电镀工艺。讨论了电镀时间、pH、温度、搅拌方式以及阴极电流密度对镀层的影响。结果表明:镀层厚度增长随着电镀时间的延长呈现先快后慢的趋势;pH=3.5时可以获得厚度适中、外观光亮的镀层;镀层的光亮程度随着温度的升高而增加,45℃时最佳;不搅拌;该工艺的可操作电流密度较宽,Jκ在4～6 A/dm2。     

克劳斯工艺防腐蚀涂层数值模拟

燃料、烟气中的高浓度硫化氢以及液滴对克劳斯工艺中燃烧设备有严重的腐蚀和冲蚀作用,很容易引发大型生产安全事故。液滴的冲蚀在金属受热面壁面产生细微裂纹是化学腐蚀的起点。涂层能够防止化学腐蚀,本文通过建立数学模型准确描述了克劳斯硫黄回收工艺中液滴撞击防腐蚀涂层的过程,运用离散迭代方法对整个计算区域进行求解,得到了撞击过程中防腐蚀涂层内部、涂层与固体黏结面以及固体内部的应力分布,确认了涂层方案能够在克劳斯硫黄回收工艺中解决金属受热面液滴冲蚀的问题;同时研究了不同厚度的涂层对应力分布的影响,得出了量纲为1最大应力与撞击速度之间的经验公式,提出采用20μm厚的氮化硅涂层是经济高效的克劳斯工艺壁面保护措施。     

加强涂装过程控制 消除潜在质量隐患

论述了船舶涂料涂装过程控制和控制要素,强调涂料涂装过程控制的重要性,只有加强过程控制,才能确保配套涂层的质量。     

Operability limits of slide coating

Slide coating is one of the pre-metered methods used for high precision single and multilayer coatings. The thickness of each liquid layers is set by the flow rate and web speed only and it is independent of other process parameters. The uniformity of the deposited layer, however, is affected by the operating conditions. In the design of coating processes, it is crucial to know the set of conditions at which the deposited layer is adequately uniform, i.e. to define the operability window of the process. We developed a theoretical model of slide coating flow by solving the full two-dimensional Navier–Stokes equations and used it to uncover the mechanisms of coating bead breakdown at low vacuum, high vacuum, and low flow limits. With full understanding of the bead breakup processes, we then constructed a theoretical coating window as a function of coating thickness, web speed, and applied vacuum. A simple stability criterion was used to predict the onset of ribbing instability and deployed to add the onset of ribbing limit inside the coating window.     

水性免中涂涂装工艺研究

在汽车涂装中,水性免中涂涂装工艺因工艺流程少、污染排放和能耗低而受到愈来愈多的关注,它将成为今后汽车涂装的主流。本文从涂膜性能指标、面漆颜色效果、闪干流平时间和清漆设计等方面对水性免中涂涂装工艺进行了研究,分析了清漆厚度、第2道面漆的喷涂遍数、中间闪干流平时间和旋杯型号选择对汽车外观质量的影响以及存在的问题,获得了实现最佳外观的汽车水性免中涂涂装工艺方案。     

Theoretical prediction on double-layer coating in wet-on-wet optical fiber coating process

A theoretical investigation is conducted on the wet-on-wet (WOW) process for double-layer resin coating of optical glass fiber. The coating process in the secondary coating die is modeled as a simple two-layer Couette flow of two immiscible fluids in an annulus with an assigned pressure gradient. The assumption of fully developed flow permits an exact solution to the Navier–Stokes equations. The solution discloses the relevant parameters in design and operation of a WOW coating applicator of optical fiber. For a given diameter of glass fiber and primary coating thickness, the secondary coating thickness is a function of the applied pressure gradient, the diameter of coating die, the viscosity ratio, and the fiber drawing speed. The influences of each of these control parameters on double-layer coating are scrutinized. A practical concept of thermal control of the coating process utilizing temperature-dependent viscosity of coating resins is explored.     

风力电机涂装工艺及管理要点

主要介绍了风力电机涂装工艺中涂装前处理、底漆、中涂漆、面漆及涂层修补等的工艺过程及工艺参数,并对其主要工艺管理要点和易出现的缺陷及预防措施进行说明。     

高速动车组外风挡橡胶的涂装工艺

介绍了高速动车组外风挡橡胶的涂装配套体系及相关性能指标。根据橡胶风挡涂装特点制定了涂装工艺流程和工艺控制要点。     

铜件镀银生产线电机自动驱动系统设计

传统半自动电镀生产线在铜件表面镀银过程中,由于自动化程度较低,对各工艺环节的时间控制精度差,导致银镀层厚度、致密度、电导率和光亮度指标不稳定。设计一种铜件镀银生产线中直线电机自动驱动系统,首先设定不同的活化、浸银和电镀银等工序的时间,进行实验,提取不同时间下银镀层的厚度、电导率和光亮度指标;通过对比,选取各工序最优的控制时间,作为直线电机自动驱动系统硬件和参数设定的依据;软件流程采用智能PLC与单神经元控制相结合的算法,实现铜件表面镀银过程的自动化控制。实验证明,该设计系统能够精确的控制时间并精准定位,改善银镀层电导率和光亮度。     

Spray coating process variable and property analysis of UV-curable polyurethane acrylate coating on polycarbonate substrate

A series of spray coating experiments were conducted on an UV-curable, polyurethane-modified, acrylate-based coating formulation with the aim to control defects, coating thickness, and thickness variation. Statistical approaches including design of experiment, residual examination, analysis of variance, and t-test were used in designing the experiments and analyzing data. Viscosity of formulation, atomizing pressure, liquid feeding pressure, distance between nozzle and substrate, and travel speed of substrate were the process variables studied. The ranges of process variables that gave defect-free coating were identified and used in the subsequent experiments to determine process variables and interactions that had significant contribution to the changes in coating thickness and thickness variation. All process variables studied were found to have contribution to the change in coating thickness, but they showed no significant contribution to the variation of coating thickness. No interaction displayed significant contribution. Confirmation tests performed on extra samples prepared with varying coating thicknesses indicated a good agreement with the experimental results. Additional samples were tested for total transmittance, transmission haze, adhesion, surface roughness, hardness, scratch hardness, abrasion resistance, and durability to attack of car wash chemicals. Spray coated samples showed slight improvement in the total transmittance over the uncoated samples, while maintaining the transmission haze and exhibiting rougher surfaces. Only samples with thin coatings were found to possess sufficient adhesion to the substrate. These thin coatings gave improved hardness, scratch hardness, and durability to car wash attack to the level comparable to commercial coated polycarbonate headlamp lenses, whilst giving better abrasion resistance.