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1前言镀铝锌钢板表面再进行耐指纹处理后,赋予了镀铝锌层表面优良的耐指纹特性和良好的耐蚀性、耐热性、导电性等。冷轧板厂生产两种类型的耐指纹钢板,一种是无Cr(VU耐指纹型,应用的是以Zr盐为主的耐指纹液;一种是有Cr(VI)耐指纹型,应用的是传统含Cr(VI)钝化型耐指纹液。 相似文献
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在常温及高温条件下,利用表面性能分析仪和拉延设备考察了三种固体润滑助剂(聚乙烯润滑助剂、聚四氟乙烯润滑助剂及聚乙烯/四氟润滑助剂)对热镀铝锌耐指纹钢板表面摩擦特性的影响,并采用三维视频显微镜分析了镀铝锌耐指纹钢板表面划痕状态及深度。结果显示,在常温条件下,固体润滑助剂的加入不仅降低了耐指纹钢板表面的动摩擦因数,而且还提高了耐指纹钢板表面的抗磨损性和加工成型性。在高温条件下,聚乙烯润滑助剂软化导致耐指纹钢板表面润滑性能降低,并影响其加工成型性。聚四氟乙烯及聚乙烯/四氟润滑助剂的软化点较高,在高温下能够保持润滑粒子表面硬度及润滑性能,从而显著提高耐指纹钢板在高温下的表面润滑性能。 相似文献
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针对鞍钢镀铝锌板在冲压过程出现表面发黑现象,利用扫描电镜与XPS对镀铝锌板进行检测,分析其冲压发黑的根本原因。结果表明,在铝锌镀层钢板冲压过程中,表面耐指纹膜破坏脱落,在缺少耐指纹膜润滑的条件下,模具对钢板的摩擦会使铝锌镀层产生剥落和氧化发黑。 相似文献
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基于马钢彩涂生产工艺,开展了彩涂热镀铝锌有铬耐指纹板的试制,并通过耐碱性和耐腐蚀性等试验方法对三家供应商提供的有铬耐指纹板进行试验分析。结果显示,马钢彩涂生产线基本掌握了热镀铝锌有铬耐指纹板的生产工艺技术,并且通过试验分析优选出一家最适合的耐指纹液供应商。 相似文献
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热浸镀铝钢板(下称镀铝钢板)具有优良的耐蚀性、耐热性和耐大气腐蚀性,所以广泛用于汽车排气、热器具和建筑等用途,特别在建筑领域,工厂和仓库的屋顶、外壁都使用这种材料。 相似文献
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本文通过对无铬耐指纹药剂配方优化、无铬耐指纹产品膜厚、生产运行速度等研究与控制,涟钢生产的无铬耐指纹产品具备比较优异的表面电阻、高温耐黄变、烤漆性能、耐蚀性能等性能;同时解决了表面偏暗、条锌、云状等表面缺陷,研发出的无铬耐指纹产品满足电子电器行业高表面质量的要求。 相似文献
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Denny A. Jones 《Metallurgical and Materials Transactions A》1985,16(6):1133-1141
A mechanism of stress corrosion cracking (SCC) is outlined in which anodic dissolution at film rupture sites relieves strain
hardening and reduces the fracture stress at the crack tip. Experimental evidence is cited to suggest that relief of strain
hardening occurs by interaction of subsurface dislocations with divacancies generated by the anodic dissolution. A transgranular
crack propagates by accumulation of divacancies on prismatic planes which then separate by cleavage under plane strain conditions
at the crack tip. At appropriate metallurgical and chemical conditions, anodic dissolution and/or divacancy migration may
be enhanced at grain boundaries, leading to an intergranular failure mode. Evidence is also available to indicate that cyclic
loading relieves strain hardening. Relief of strain hardening by combined cyclic loading and corrosion accounts for the higher
incidence of corrosion fatigue cracking (CFC) without the requirement of any critical dissolved species. Data on fatigue of
stainless steel at elevated temperature in both vacuum and air provide additional support for the proposed mechanism. 相似文献
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《中国稀土学报(英文版)》2016,(3)
The influences of the hot extrusion process on the microstructure, corrosion behavior and corrosion mechanism for Mg-Y magnesium alloy were studied by means of the microstructure observation, weight loss test, electrochemical test and corrosion morphology test. The results showed that with increasing of the extrusion ratio, the shear flow line on the vertical section of the extruded alloy increased, the shear bands parallel lines became more clearly visible, and a large number of fine equiaxed grains distributed in parallel with the flow lines. The open circuit potential had a certain degree of improvement after extrusion, the open circuit potential increased with increment of extrusion ratio, and the corrosion potential of the vertical section was higher than that of the same alloy in the same compression ratio. The shift rate of the corrosion potential relatively became larger with increasing of the extrusion ratio, and the cathode corrosion current corresponding to the branch migration shifted to the positive direction. The high frequency capacitive arc increased with increment of the extrusion ratio, and the radius of capacitive arc of the vertical section was slightly larger than that of the transverse section. The corrosion morphologies of Mg-0.25 Y alloy were uniform corrosion, and the corrosion morphologies of Mg-(2.5, 5, 8 and 15) were the pitting corrosion and the small range, deep depth localized corrosion. 相似文献
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单宁酸由于环保、价格低的特点在金属保护方面应用广泛,然而单一利用单宁酸作为缓蚀剂取得的效果有限,有研究表明盐类与缓蚀剂复配可以改善缓蚀剂的缓蚀效果。在此基础上进行单宁酸复配缓蚀剂的研究,采用两种复配剂氯化铁、钼酸钠分别与单宁酸(TA)缓蚀剂进行复配,研究其对碳钢Q235的缓蚀效果。通过硫酸铜点滴实验、浸泡实验、电化学实验对比氯化铁、钼酸钠分别与单宁酸复配后在碳钢表面的成膜特性及缓蚀效果。硫酸铜点滴液变色时间随着单宁酸中氯化铁和钼酸钠两种化合物浓度的升高出现先增加后降低的趋势;浸泡实验可以看出在单宁酸中加入氯化铁和钼酸钠后,碳钢表面仅出现个别点蚀坑;根据电化学测试结果,对比加入氯化铁前后单宁酸缓蚀剂对碳钢的缓蚀效果,发现两者的电荷转移电阻由2698变为3711 Ω·cm2,腐蚀电流密度由2.734降为1.902 μA·cm?2。加入钼酸钠后,电荷转移电阻和腐蚀电流密度存在明显的增加与下降,电荷转移电阻由2698变为5100 Ω·cm2,腐蚀电流密度由2.734降为0.714 μA·cm?2。在单宁酸中添加氯化铁和钼酸钠都能改善单宁酸的缓蚀效果,其中单宁酸与钼酸钠复配的缓蚀效果更好。 相似文献
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Hydrogen-facilitated corrosion and stress corrosion cracking of austenitic stainless steel of type 310 总被引:2,自引:0,他引:2
Qiao Lijie Chu Wuyang Miao Huijun Xiao Jimei Guo Peixin 《Metallurgical and Materials Transactions A》1993,24(4):959-962
The effects of hydrogen précharge and stress on anodic dissolution for Type 310 austenitic stainless steel (ASS) have been
investigated. An experiment determining the effect of hydrogen on stress corrosion cracking (SCC) was carried out in a boiling
42 pct MgCl2 solution and in a 2.5 mo/L H2SO4 + 1 mol/L HC1 solution. The results showed that both hydrogen and stress would increase the dissolution rate, and the effects
of hydrogen and stress on the dissolution rate were synergistic rather than simply additive. Hydrogen lowered the threshold
stress and the shortened fracture time of SCC in a boiling MgCl2 solution by a factor of 1/5 and 10, respectively. 相似文献
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通过研究镀锡板硫蚀时间对腐蚀产物成分的影响,可以促进对镀锡板硫蚀机理的理解和硫变发黑问题的解决。实验通过改变镀锡板在硫化钠-乙酸模拟溶液(pH6)中的浸泡时间,使用X射线光电子能谱仪(XPS)对不同硫蚀时间下得到的产物主要元素质量分数及S的组元和价态进行刻蚀分析。结果显示在硫蚀时间由2、9d并延长到23d的过程中:S元素质量分数逐渐升高,O元素质量分数先降低再升高,在最终稳定的硫蚀产物中,金属元素Sn的质量分数接近于0,Fe元素质量分数在60%上下浮动,金属Sn只能为基体提供物理保护作用;硫蚀产物中S元素组元主要有S单质、S-和S2-构成且不发生变化,但各价态组分的相对含量发生改变,即低价态S质量分数降低,高价态S质量分数升高,S元素组合态在硫蚀过程中呈现被氧化的趋势。增大Sn层厚度和均匀性、在罐装物中添加还原性物质是改善硫蚀的有效途径。 相似文献