硅烷自组装单分子层生长条件的优化

对长碳链硅烷在玻璃片表面自组装形成单分子层膜进行研究。以甲苯为溶剂,使辛烷基三乙氧基硅烷(OTES)、十二烷基三甲氧基硅烷(DTMS)、3-胺丙基三乙氧基硅烷(APTES)和十八烷基三氯硅烷(OTS)在玻璃表面进行生长,考察反应时间、反应浓度和可水解基团对自组装单分子层膜的影响。用接触角仪和全反射红外光谱仪(FT-IR)对单分子膜进行表征。结果表明:带有—Cl水解基团的OTS最易生长,而带有乙氧基离去基团的OTES比带有甲氧基的DTMS容易反应。在24℃时,1 mmol/L OTES反应20 min自组装单分子层膜生长很好,并且表面比较规整均一。     

铜合金表面硅烷膜的制备及防腐性能研究

通过扫描电子显微镜、接触角和电化学工作站等测试方法,研究了γ-氨丙基三甲氧基硅烷(γ-APS)自组装膜对铜合金表面在3.5%NaCl溶液中的耐腐蚀性。结果表明,经酸性FeCl3溶液刻蚀,再在V(γ-APS)∶V(乙醇)∶V(水)=1∶9∶20、温度30℃、水解8h的γ-APS溶液中自组装50min,构建的铜合金表面硅烷膜接触角可从处理前的73°增大到119°,此时表面硅烷膜在模拟海水的实验中对铜合金的缓蚀效率可达89.2%。     

单组分室温硫化硅橡胶的配制(十)

介绍了脱醇型单组分室温硫化(RTV-1)硅橡胶密封剂常用的增粘剂。着重介绍了1，3，5-三(三甲氧硅丙基)聚异氰酸酯与氰乙基三甲氧基硅烷、MDT硅油的增粘体系，1，3，5-三(三甲氧硅丙基)聚异氰酸酯与γ-环氧丙氧丙基三甲氧基硅烷及γ-甲基丙烯酰氧丙基三甲氧基硅烷的增粘体系，γ-氨丙基三乙氧基硅烷和碳酸钙的增粘体系，γ-氯丙基烷氧基硅烷和钛催化剂的增粘体系。     

硅烷偶联剂对热镀锌钢板无铬钝化液性能的影响

在含纳米Si O2的乙醇溶液中分别令乙烯基三乙氧基硅烷(KH-151)、N-(β-氨乙基)-γ-氨丙基三甲氧基硅烷(KH-792)、γ-氨丙基三乙氧基硅烷(KH-550)、γ-(2,3-环氧丙氧)丙基三甲氧基硅烷(KH-560)、甲基三甲氧基硅烷(MTMS)水解,然后与不饱和聚酯改性丙烯酸树脂乳液混合,制备了几种硅烷偶联剂/树脂复合钝化液,再涂抹于热浸镀锌钢板上。通过中性盐雾试验、醋酸铅点滴腐蚀试验测其耐蚀性,采用扫描电镜和能谱仪分析膜层的微观结构与元素组成,利用极化曲线和电化学阻抗谱研究其耐蚀机理,并考察了钝化液的室温贮存稳定性,以及钝化膜与环氧底漆/聚氨酯面漆体系的配套性能。结果显示,KH-151/树脂复合钝化液在室温下至少能放置12 d,其所制备的钝化膜表面平整,中性盐雾试验72 h之后的腐蚀面积小于5%,耐醋酸铅点滴腐蚀时间长达7 200 s,与后续漆膜的配套性能可达到含铬钝化膜的水平。     

江西晨光新材料有限公司简介

正江西晨光新材料有限公司创建于2006年,注册资金5300万港元,原名"诺贝尔(九江)高新材料有限公司"2012年7月进行了名称变更,现位于江西湖口高新技术产业园——-湖口县金砂湾工业园内,占地面积372亩,已经建成了三氯氢硅、三甲氧基硅烷、3-氯丙基三乙氧基硅烷、双-(γ-三乙氧基硅基丙基)四硫化物、乙烯基硅烷、γ-氨丙基三乙氧基硅烷(KH-550)、3-缩水甘油醚氧基丙基三甲氧基硅烷(KH-560)、3-(甲基丙烯酰氧)丙基三甲氧基硅烷(KH570)等15个产品     

江西晨光新材料有限公司简介

正江西晨光新材料有限公司创建于2006年,注册资金5300万港元,原名"诺贝尔(九江)高新材料有限公司"2012年7月进行了名称变更,现位于江西湖口高新技术产业园——湖口县金砂湾工业园内,占地面积372亩,已经建成了三氯氢硅、三甲氧基硅烷、3-氯丙基三乙氧基硅烷、双-(γ-三乙氧基硅基丙基)四硫化物、乙烯基硅烷、γ-氨丙基三乙氧基硅烷(KH-550)、3-缩水甘油醚氧基丙基三甲氧基硅烷(KH-560)、3-(甲基丙烯酰氧)丙基三甲氧基硅烷(KH570)等15个产品     

γ-缩水甘油醚氧丙基三甲氧基硅烷的合成

对γ-缩水甘油醚氧丙基三甲氧基硅烷的合成工艺进行了研究。以无水甲醇作溶剂,在组合催化剂存在下,烯丙基缩水甘油醚和三甲氧基硅烷发生硅氢加成反应制得γ-缩水甘油醚氧丙基三甲氧基硅烷。讨论了影响反应的主要因素,得出了最佳合成工艺条件:组合催化剂用量为200μL/mol三甲氧基硅烷、n(烯丙基缩水甘油醚):n(三甲氧基氢硅)=1.2:1、反应温度80℃、反应时间3h。在此条件下,γ-缩水甘油醚氧丙基三甲氧基硅烷的收率可达92.6%。     

气相色谱法检测硅酮密封胶的交联剂和偶联剂的纯度

采用气相色谱法,根据相似相溶的踏板洗脱原理,采用非极性高性能毛细管色谱柱检测硅酮密封胶的常用交联剂(甲基三丁酮肟基硅氧烷、乙烯基三丁酮肟基硅氧烷)和偶联剂(N-β-(氨乙基)-γ氨丙基三甲氧基硅烷、γ-氨丙基三乙氧基硅烷、四丙氧基硅烷)的纯度。     

江西晨光新材料有限公司简介

正江西晨光新材料有限公司创建于2006年,注册资金5300万港元,原名"诺贝尔(九江)高新材料有限公司"2012年7月进行了名称变更,现位于江西湖口高新技术产业园——-湖口县金砂湾工业园内,占地面积372亩,已经建成了三氯氢硅、三甲氧基硅烷、3-氯丙基三乙氧基硅烷、双-(γ-三乙氧基硅基丙基)四硫化物、乙烯基硅烷、γ-氨丙基三乙氧基硅烷(KH-550)、3-缩水甘油醚氧基丙基三甲氧基硅烷(KH-560)、     

江西晨光新材料有限公司简介

正江西晨光新材料有限公司创建于2006年,注册资金5300万港元,原名"诺贝尔(九江)高新材料有限公司"2012年7月进行了名称变更,现位于江西湖口高新技术产业园——-湖口县金砂湾工业园内,占地面积372亩,已经建成了三氯氢硅、三甲氧基硅烷、3-氯丙基三乙氧基硅烷、双-(γ-三乙氧基硅基丙基)四硫化物、乙烯基硅烷、γ-氨丙基三乙氧基硅烷(KH-550)、3-缩水甘油醚氧基丙基三甲氧基硅烷(KH-560)、3-(甲基丙烯酰氧)丙基三甲氧基硅烷(KH570)等15个产品20条生产线,是一家融科研、生产、经营为一体的有机硅烷偶联剂高新技术企业,也是当前国内     

7075铝合金表面硅烷化处理的研究

对7075铝合金进行了硅烷化处理,并对硅烷膜的厚度、吸水率、成分、形貌及耐蚀性等进行了分析。硅烷处理液通过水解和缩合反应形成Si-O-A1共价键,覆盖在铝合金表面形成硅烷膜。结果表明:硅烷膜表面均匀、致密,吸水率仅为0.763%。,厚度约为4um;铝合金经过硅烷化处理后,膜电阻至少增加了两个数量级,自腐蚀电位正移一0・331 V,自腐蚀电流密度降低了近两个数量级,耐蚀性明显提高。     

Electrodeposition of silane films on aluminum alloys for corrosion protection

In this paper, three types of protective silane films, methyltrimethoxysilane (MTMS), vinyltrimethoxysilane (VTMS) and dodecyltrimethoxysilane (DTMS) were prepared on aluminum alloys AA 2024-T3 by electrodeposition technique. The Reflection-Absorption Fourier Transform IR (FTRA-IR) measurements showed that, the silane films were successfully deposited through chemical bonding between silane agents and Al alloys. Electrochemical impedance spectroscopy (EIS) tests indicated that in comparison with those by conventional “dip-coating” method, silane films electrochemically prepared at cathodic potentials exhibited obviously higher corrosion resistances. “Critical potential” was all observed for each silane system. Silane films prepared at this potential performed the highest corrosion resistance. The scanning electron microscopy (SEM) images indicated a potential dependence of surface morphology of silane films. The highest compactness was obtained at the “critical potential”. Due to the presence of long hydrophobic dodecyl chain in bone structure, DTMS films displayed the highest barrier properties.     

Electro-assisted preparation of dodecyltrimethoxysilane/TiO2 composite films for corrosion protection of AA2024-T3 (aluminum alloy)

Thin films of organosilanes have been successfully used as the alternative to toxic chromate coatings for surface pretreatment of metals and alloys. To further improve their corrosion performance, in the present work nano-scaled TiO₂ particles were added to the dodecyltrimethoxysilane (DTMS) films coated onto AA2024-T3 substrates, by using either the dip-coating or the cathodically electro-assisted deposition process. The obtained composite films were investigated by scanning electron microscopy (SEM), atomic force microscopy (AFM), water contact angle measurements, Fourier transform reflection-absorption IR (FTRA-IR) and electrochemical impedance spectroscopy (EIS). The results show that these two techniques (nanoparticles incorporation and the electro-assisted deposition) both facilitate the deposition process of silane films, giving thicker deposit and higher coverage surface along with higher roughness and hydrophobicity, and thereby improve their corrosion resistance. Moreover, the corrosion performance of silane films is further improved by the combined use of nanoparticles modification and electro-assisted deposition.     

Corrosion protection of Nd–Fe–B magnets by silanization

Nd–Fe–B type permanent magnets present excellent magnetic properties. However, they are highly sensitive to the attack of corrosive environment. The aim of the present work is to describe the improvement of corrosion resistance of such magnets by dodecyl trimethoxysilane (DTMS) treatment. Electrochemical impedance spectroscopy (EIS) tests showed that, after treated by either DTMS, phosphate or chromate precursor, the protectiveness of Nd–Fe–B alloys was apparently increased. Corrosion performance of magnet treated with silane only was slightly inferior to those of phosphatized or chromatized ones. However, significant improvement in corrosion protection was achieved after two-step treatments, i.e. by top-coating silane films on phosphate or chromate under-layer. The depth profiles of element concentrations on surfaces measured by secondary ion mass spectroscopy (SIMS) indicate a two-layer surface structure for two-step treated samples. Co-existing of silane and phosphate or chromate was detected in the top-layer, suggesting the interaction between the two components. This results in the formation of more stable structure of hybrid organ–inorganic coatings against the attack of corrosive species.     

铝合金表面新型硅烷膜的制备及表面形貌研究

通过正交试验确定了铝合金表面硅烷膜技术的最佳工艺参数。在基础配方上制备了硅烷膜,利用硫酸铜点滴试验评价了工艺参数,结果表明,水解温度、硅烷浓度、醇水比及pH主要影响了硅烷溶液的水解与缩合反应。分析了硅烷膜的表面形貌、初步探讨了硅烷膜的耐腐蚀性能,结果表明,硅烷膜均匀、致密,具有比铬酸盐钝化更优的防护作用。     

铝合金表面GPTMS硅烷膜的制备及耐蚀性能研究

为提高铝合金耐腐蚀力，运用正交试验法研究在铝合金表面制备 γ-（2，3-环氧丙氧）丙基三甲氧基硅烷（GPTMS）自组装膜最佳工艺条件，利用极化曲线和扫描电子显微镜研究该硅烷膜在铝合金表面的耐腐蚀性能。研究表明：最佳工艺条件为 100 mL溶液中， pH＝4. 5，V（GPTMS）∶V（EtOH）∶V（H₂O）= 2∶7∶91，T_{1（水解温度）}＝25 ℃，t_{1（水解时间）}＝7 h，t_{2（浸涂时间）}＝10 min，t_{3（固化时间）}＝90 min，T_{2（固化温度）}＝120 ℃，该工艺条件下制备的硅烷膜具有优异的耐腐蚀性能。     

Enhanced corrosion resistance of AA 2024-T3 and hot-dip galvanized steel using a mixture of bis-[triethoxysilylpropyl]tetrasulfide and bis-[trimethoxysilylpropyl]amine

The corrosion resistance of AA 2024-T3 and hot-dip galvanized steel (HDG) was studied after treatment with bis-[3-(triethoxysilyl)propyl]tetrasulfide (bis-sulfur silane), bis-[trimethoxysilylpropyl]amine (bis-amino silane), and their mixture. Electrochemical tests in neutral 0.6 M NaCl as well as scanning electronic microscopy (SEM)/energy-dispersive X-ray spectroscopy (EDX) were performed. The results showed that: (1) hydrophilic bis-amino silane did not offer good corrosion protection on either of the metals. This is probably because the bis-amino silane film tends to be positively charged. This promotes ingress of anions like Cl⁻ ions as well as water into the film by electrostatic attraction. As a result, corrosion readily proceeds at the interface. (2) Hydrophobic bis-sulfur silane performed very well on AA 2024-T3, but failed on HDG. The failure here stems from non-uniform film coverage on HDG owing to an insufficient wetting of bis-sulfur silane solution on the Zn oxide on HDG. Local corrosion initiates at defective sites which are poorly covered by the silane film. (3) A bis-sulfur/bis-amino mixture at the ratio of 3/1 greatly enhanced the corrosion resistance of both AA 2024-T3 and HDG. This substantial improvement is achieved by selectively overcoming the major shortcomings of the individual silanes.     

紫铜海水管焊接部位在人工海水中的腐蚀行为

通过阳极极化曲线、交流阻抗测试、扫描电镜研究了紫铜海水管焊接部位在人工海水中的腐蚀行为.结果表明：紫铜、白铜焊缝和黄铜焊缝在人工海水中的阳极过程类似,相同电位下,白铜焊缝的电流密度最小,耐蚀性最佳,与阻抗测试结果一致.黄铜焊缝在电位-0.012 V时出现电流峰,腐蚀产物膜多孔、疏松,随后电极进入钝化区,钝化膜由Cu₂O、CuCl和ZnO组成;随电位升高,钝化膜溶解,发生铜锌置换反应,沉积的Cu导致活性电对的形成,增加了合金的腐蚀速度;当电位为＋0.87 V时,电极表面富集了针状锡和锡的氧化物.随后,电极表面积累的锡和锡的氧化物及腐蚀产物层对脱锌腐蚀有一定的阻碍作用,电流密度有所下降,最后腐蚀达到一种动态平衡,腐蚀机制为溶解-再沉积机理.     

镀锌钢板无机硅烷复合钝化的研究

制备了一种含钛、磷、钒的无机混合液,并掺入到硅烷液中,研究其在镀锌钢板表面的钝化行为.通过CUSO4点滴实验、极化曲线法及扫描电子显微镜测试钝化膜的耐蚀性能及表面形貌.结果表明:镀锌钢板的表面经无机-硅烷钝化后,其耐蚀性明显优于单一硅烷钝化膜的.     

冷轧钢表面硅烷复合膜的制备及耐蚀性能

采用浸涂技术,在冷轧钢板(CRS)表面制备掺杂铈离子和铬离子的γ-(2,3-环氧丙氧)丙基三甲氧基硅烷复合膜。通过电化学方法研究硅烷膜在3.50%的氯化钠溶液中的耐蚀性能,并用SEM研究存在复合硅烷膜的冷轧钢在腐蚀前后的形貌变化。结果表明掺杂了铈离子和铬离子的硅烷溶液在pH为4,水解温度为50℃,水解时间为8h条件下水解效果最好,使形成复合硅烷膜的冷轧钢在3.50%的氯化钠溶液中的自腐蚀电流密度下降到1.584×10-7A·cm-2,自腐蚀电位正移。经SEM测试表明,掺杂了铈离子和铬离子的复合硅烷膜在腐蚀前后的形貌几乎不变,耐蚀性能明显优于未掺杂的纯硅烷膜。