【正文】 r– water interface. The calculated values of the maximum surface excess showed increasing trend from SB2020decanoate to SB2020oleate as represented from the slope of preCMC region of surface tension profile (Fig. 1). The maximum surface excess values were increased from decanoate to oleate derivatives indicating higher surface concentration and increasing number of surfactant molecules at the interface. Values of the minimum surface area occupied by the nonionic Schiff base amphiphiles at the interface (Amin) were calculated according to the equation: where, Γ max and NAV are the maximum surface excess and Avogadro’ s number, respectively. Increasing the maximum surface excess values indicates the increasing of adsorbed molecules at the interface, hence the area available for eachmolecule will decrease. That causes the pacting of surfactant molecules at the interface to form denser layer. The values of critical micelle concentration, effectiveness, maximum surface excess and minimum surface area of the Schiff base nonionic amphiphiles were listed in Table 2. . 表面活性 . 疏水鏈 （非極性鏈） 長度的影響 Fig. 1表示表面張力與合成的包含相同分子量聚乙二醇 (n=45 EO 單元 )的非離子型兩親席夫堿濃度直接的聯(lián)系。測試的樣品用蒸餾水和乙醇洗滌后，干燥，稱重。真空蒸餾除去未反應(yīng)的物料和溶劑，方案 2 .記非離子型席夫堿產(chǎn)物為 SBPEG鏈烷酸（ R），列在表 1中。 2. Experimental procedures . Synthesis of Schiff bases mol of anisaldehyde was condensed with mol of paminobenzoic acid in the presence of 250 mL of ethyl alcohol as a solvent. The reaction mixture was refluxed for 6 h and then left overnight until the product was precipitated. The product was washed by petroleum ether and recrystallized from ethanol. The final product was dried under vacuum at 40 ?C [15]. The produced Schiff base was denoted as SB and the chemical structure was represented in Scheme 1. Scheme 1. Chemical structure of the synthesized Schiff base. Scheme 2. Chemical structure of the synthesized nonionic Schiff base. 茴香醛 和 250mL的無水乙醇做溶劑。 這些物質(zhì)通常 能 有效地吸附在金屬表面。 1. Introduction Ferrous, nonferrous metals and their alloys are extensively used in industry. To remove unwanted scale and salt deposits or mill scales formed during manufacture, metals are immersed in acid solutions, which are known as an acid pickling bath. After the scale is removed, the metal may be subjected to attack by the acids. In order to reduce the degree of metal attack and rate of consumption of the acid, corrosion inhibitors are added to the pickling solutions Hydrochloric and sulphuric acids are the most monly used acids in the pickling bath [1,2]. Most mercial inhibitor formulations include aldehydes and amines in their structure [3,4]. The choice of the inhibitors is based on two considerations: first, they could be synthesized conventionally from relatively cheap raw materials。 關(guān)鍵詞：非離子表面活性劑 希夫堿 吸附 表面張力 緩蝕 緩蝕速率 緩蝕效率 a b s t r a c t A novel series of selfassembled nonionic Schiff base amphiphiles was synthesized and their chemical structures were confirmed using elemental analysis, FTIR spectroscopy and 1H NMR spectra. The surface activities of these amphiphiles were determined based on the data of surface and interfacial tension, critical micelle concentration, effectiveness, efficiency, maximum surface excess and minimum surface area. Thermodynamics of adsorption and micellization processes of these amphiphiles in their solutions were also calculated. The surface and thermodynamic data showed their higher tendency towards adsorption at the interfaces. The synthesized amphiphiles were evaluated as corrosion inhibitors for aluminum (3SR) at different doses (400– 10 ppm) in acidic medium (4N HCl) using weight loss and hydrogen evolution techniques. The corrosion measurements showed that the synthesized nonionic Schiff bases could serve as effective corrosion inhibitors. The surface and corrosion inhibition activities were correlated to the chemical structures of the inhibitors. 摘要 一種新型系列自組裝非離子型兩親 Schiff堿被合成，它們的化學(xué)結(jié)構(gòu)用元素分析法確定，紅外光譜和核磁共振氫譜。 second, they contain the electron clouds on the aromatic rings or, the electronegative atoms such as benzene ringcontaining Schiff bases [5,6]. Schiff base inhibitors have been reported as effectively corrosion inhibitors for steel, copper and aluminum [7– 9]. These substances generally bee effective by adsorption on the metal surface. Adsorption depends on the nature and charge of the metal and also, on the chemical structures of the inhibitors [10]. Selfassembled mono layer can provide a convenient method for corrosion inhibition,since the process of selfassembling is simple, and the chemical position and thickness of selfassembled mono layers can be tailored by design and synthesis of the adsorption agent. The practical applications of selfassembled mono layers as corrosion inhibitors were explored by several investigators [11– 14]. It was found that densely packed selfassembled mono layers heteroatom containing pounds were effective for