共查询到20条相似文献,搜索用时 666 毫秒
1.
2.
3.
德国明斯特消息,全球领先的免铬酸盐卷材涂料底漆供应商——巴斯夫涂料公司,日前在德国推出了环境友好的COILTEC UNIVERSAL PCF涂料,年产量可以达到每年3万吨的生产规模。作为巴斯夫第三代免铬酸盐卷材底涂产品,该产品的通用性极强,能够满足未来对金属卷材涂料更加严格的环保和性能标准。 相似文献
4.
随着彩板应用数量和范围迅速扩大.卷材涂料已进入快速发展期。今后彩板及其涂料的走势将趋向高性能、环保和经济性。为避免无序和盲目的市场竞争,进一步加强行业规范势在必行,钢结构行业、彩板行业与涂料行业应联合势在必行。不久前结束的第四届国际彩板及涂料涂装技术研讨会和2006国际彩板及涂料涂装市场论坛付出了这一讯息。 相似文献
5.
6.
7.
彩板涂料固化温度曲线的测定 总被引:1,自引:0,他引:1
在卷材有机涂层钢板生产中,涂料的固化温度是影响产品质量的重要因素。使用BYKOTRACK和GRADIENT-OVEN测出不同基板、不同涂辩的固化温度曲线.并控制固化过程温度参数,可使每次生产都获得最佳固化温度,从而大大减少废、次品,经济效益十分显著。 相似文献
8.
9.
10.
1 前言欧洲一家新建工厂目前用粉末涂料对铝卷材进行连续涂覆。该粉末涂覆工艺使轧制铝卷材获得的涂层硬度和厚度能与已有20年使用历史的铝型材粉末涂层的相媲美,这与以前仅用液体涂料涂覆铝卷的工艺相比,无疑是一种经济的方法。PCC(铝卷材粉末连续涂覆)的涂层厚度大于普通的液体连续涂覆,与粉末涂覆铝型材的表面质量完全一样,同时,涂覆工艺也具有良好的环境适应性。 相似文献
11.
12.
13.
随着发动机的服役温度日益升高,工作环境日益恶劣,涡轮叶片极易在高温环境中氧化,大大降低了叶片的使用寿命。如何在低成本下制备保护性能好的高温防护涂层,是当前国内外研究的重点。MCrAlY包覆涂层可分为NiCrAlY涂层、CoCrAlY涂层和NiCoCrAlY涂层,这3类涂层的抗氧化性能和抗腐蚀性能较好,又有很好的塑韧性和抗热疲劳性能,因此可作为涂层或热障涂层的黏结层材料。综述了涂层中主要元素(Al、Cr、Co、Y)、掺杂合金元素(Ta、Re、Si、Pt)、涂层制备工艺和预处理工艺对MCrAlY涂层性能的研究进展。结果表明,可以通过调节MCrAlY涂层的成分来实现涂层性能的调控。向MCrAlY涂层中掺入Si、Ta和Re等活性元素,可显著提高涂层的抗高温氧化性能,以进一步提高发动机的工作效率和满足高温的工作环境需求。总结了采用细化涂层晶粒、掺杂纳米颗粒和制备梯度复合涂层等方法来提高MCrAlY涂层的抗氧化性能和抗腐蚀性能的研究现状,对MCrAlY涂层的发展趋势进行了展望。 相似文献
14.
B.V. Jegdi? J.B. Bajat J.P. Popi? S.I. Stevanovi? V.B. Miškovi?-Stankovi? 《Corrosion Science》2011,(9):2872-2880
The effect of different type of iron-phosphate coatings on corrosion stability and adhesion characteristic of top powder polyester coating on steel was investigated. Iron-phosphate coatings were deposited on steel in the novel phosphating bath with or without NaNO2 as an accelerator. The corrosion stability of the powder polyester coating was evaluated by electrochemical impedance spectroscopy (EIS), adhesion by pull-off and NMP test, while surface morphology of phosphate coatings were investigated by atomic force microscopy (AFM).The adhesion and corrosion stability of powder polyester coatings were improved with pretreatment based on iron-phosphate coating deposited from NaNO2-free bath. 相似文献
15.
16.
目的通过电沉积方法在镁锂合金表面制备具有高红外发射率以及高导电率的镀层,满足其在太空中散热以及电磁屏蔽的需要。方法通过前处理工艺(碱洗→酸洗→预钝化→化学镀镍磷→电镀铜)提高镁锂合金基体的耐蚀性能以及与后续镀层的结合力,并在此镁锂合金前处理工艺的条件下,电沉积多孔Zn-Ni合金镀层。通过热循环测试和电化学方法评价各镀层的电化学腐蚀行为和各镀层之间的结合力。结果各镀层之间的结合力良好,化学镀Ni-P层、电镀Cu层和多孔Zn-Ni层的耐蚀性能均优于镁锂合金基体,该组合镀层的协同作用可以有效地保护镁锂合金基体,提高其耐蚀性。结论最外层多孔Zn-Ni合金镀层主要由Ni2Zn11、NiO、NiS组成,其红外发射率为0.90,电阻率小于0.01 m?/cm。这表明多孔结构可以有效提高金属合金镀层的红外发射率,并保持合金镀层的高导电性。 相似文献
17.
R. Shoja Gharabagh A. Sabour Rouhaghdam 《Protection of Metals and Physical Chemistry of Surfaces》2017,53(1):112-117
The effects of a pretreatment process on the formation and properties of lanthanum based conversion coatings on AA2024-T3 was investigated using optical and scanning electron microscopy (SEM), X-ray diffraction (XRD) and open circuit potential (OCP) measurements. The results indicate that the conventional alkaline activation pretreatment with acidic desmutting could not create a suitable condition to produce lanthanum based conversion coating on AA2024-T3. Therefore, in this study, a new approach to produce lanthanum based conversion coating on AA2024-T3 by acidic pretreatment is proposed. The pretreatment of the alloy in acidic and chloride environments (90 s at 30 vol % HCl) creates more cathodic sites on AA2024-T3 compared to alkaline activation with acidic desmutting. Additionally, it was found that the formation stages of lanthanum based conversion coating is similar to those of cerium based conversion coating on AA2024-T3 except lanthanum ions require more localized pH increase to deposit on the alloy. 相似文献
18.
Substrate pretreatment affects the porosity of thin nickel electrolytic coatings which is a combined function of the composition and the roughness of the substrate surface. Electropolishing the substrate surface is an effective method of reducing coating porosity, whereas coatings plated on either electroetched or mechanically ground substrates are relatively porous owing to the remaining oxide layer on the substrate and the increased roughness of the substrate. For nickel coatings plated on mechanically ground rough substrates, the relationship between nickel porosity, apparent coating thickness and substrate roughness has been examined. 相似文献
19.
Pretreatment of metal parts for electrocoating Electrocoating requires very careful pretreatment because surface defects and contaminations may have a very negative influence on coating quality (surface structure remains visible, decoloration of bright colors, in particular yellowing). Adhesion and corrosion resistance of the coatings are improved by phosphate coatings (on Fe, Al, Zn); Zn phosphate coats are most suitable on Fe and Zn, and Al phosphate coatings on Al. Coating thickness, however, must not be excessive. The accelerators added to the phosphating baths have a very pronounced bearing and should therefore be carefully selected. The phosphate coatings are partially (by 10%) dissolved in the electrophoretically applied coating. 相似文献
20.
目的提高AlTiSiN涂层与刀具基材的结合强度,降低涂层表面的粗糙度,减少切削过程中涂层的剥落,改善涂层刀具的切削寿命。方法采用离子源增强的多弧离子镀设备刻蚀清理基体材料,并制备AlTiSiN涂层。利用X射线衍射仪(XRD)、扫描电镜(SEM)、粗糙度仪、划痕仪和铣削实验探讨涂层沉积前不同Ar离子刻蚀清洗工艺对AlTiSiN涂层结构、膜基结合力和涂层表面形貌的的影响,探究不同刻蚀清洗工艺对涂层刀具切削机理和切削性能的影响。结果 AlTiSiN涂层的相结构主要由(Al,Ti)N固溶体相组成,涂层沿着基体呈现柱状生长。随着高能Ar离子刻蚀电流由40 A增加至100 A,涂层的表面粗糙度降低,Ra值由140 nm降至69 nm,Sq值由226 nm降至117 nm;涂层与基体之间的结合强度增加,Lc2由41 N增加至52 N;切削加工DC53模具钢结果显示,当清洗电流增加至100 A,涂层的剥落几率降低,涂层刀具的切削寿命增加,由11 m增加至23 m。结论高能离子刻蚀前处理过程可有效增加涂层与基体之间的结合强度,降低涂层表面粗糙度,进而提高涂层刀具的切削寿命。刻蚀清洗所用电流强度越大,清洗效果越好,刀具涂层切削性能提高越明显。 相似文献