The interfaces of composites have been studied by single filament test which can reduce the interference factors caused by material processing. Efforts have been made to elucidate the effects of different silane coupling agents and their multi-layer structures on adhesion and the corrosion-resistant properties of interfaces. The results show that. 1. Single filsment test is very useful in interface study; 2. Only chemisorbed silane and silane combining with glass substrate contribute to the improvement of interface adhesion; the physisorbed siiane has no effect in this modifications 3. With proper selection of the coupling agents, the corrosion-resistant properties of interfaces can be greatly improved.

A mathematical analysis is proposed for the corrosion crevice in which polarization field, crevice geometry, surface condition,electrochemical kinetics, solution property and applied stress are represented by polarization potential and current, equivalent resistance, change of specific resistance and surface impedance respectively. The resulting differential equations are analysed and solved, from which mathematical models for several cases are obtained.■ These models have been evaluated by related experimental measurements with good agreement. With these models,potential at any point within the crevice can be calculated according to the potential outside the crevice.

The potential, pH and Cl~- concentration changes of a modulated crevice were measured simultaneously at the distance oi 4, 8, 13.5 and 18.5 mm from the crevice opening. The distribution of potential, pH and Cl~-concentration along the crevice and their changes with time in the presence and absence of stress were recorded in 3.5%NaCl solution for 3oCrMnSiA specimens. Results showed that in the absence of applied stress potential gradient increased with applied polarizaton potential, and the relationships between pH, Cl~- and crevice potential were: pH=-4-(40)/3E and [Cl~-]x=17+21E; whereas in the presence of applied stress,potential and pH change fluctunatly with time, the maximum change in potential was 70mV and that in pH was 1.5 respectively, while Cl~- concentration remained unchanged.

The anodic polarization curves of mild steel and the critical passivation concentrations of vanadate inhibitor in hot potassium carbonate solutions with various conversion degrees are determined by rotating disk electrode in stable hydrodynamic conditions. The dependence of critical passivation concentration of vanadate on the conversion degree of K_2CO_3 is discussed. The synergistic effect of vanadate and antimonyl potassium tartrate in the passivation step of mild steel in hotpotassium carbonate solutions is studied. Some proposals about prepassivation of mild steel equipments in hot potassium carbonate CO_2-stripping systems are suggested.

The oxidation behaviour of Fe-15 Cr and Fe-15Cr-0.3Ce alloys at 1000℃ and 1100℃ has been investigated by means of vacuum-thermo-microbalance, scanning electromicroscope and X-ray diffractometer.Experimental results show that Fe-rich oxide nodules are formed rapidly on the surface of Fe-15Cr alloy owing to deformation and breakdown of Cr_2O_3 film on this alloy. A positive deviation of oxidation kinetics from parabolic law occurs as a result of repeated breaks of weight-gain curves. If the alloy contains Ce, the deformation of the Cr_2O_3 film and the formation of Fe-rich oxide nodules are inhibited, and thus more smooth weight-gain curves and smaller oxidation rates are obtained.lt is found that Ce promotes growth of columnar crystal grains and enhances preferred orientation of the crystal grains in the Cr_2O_3 film. These facts suggest that diffusion of Cr ions in the film and lateral growth of the film can be affected by Ce ions.It might be thought that the above mentioned findings are associated with the decrease of growth stress and deformation of the Cr_2O_3 film.

A new anode material,Ru-Ti-Ir-Mn oxides coated Ti, was developed. The results of laboratory and field test show that this anode is of good performance in seawater namely: adaptability at high current density, low consumption and low polarization. The reasons for the failure of this anode in severe environments are discussed. The anode has been used for impressed currcent cathodic protection of a floating pier at 500A/m~2 for two years without evident changes in quality. The authors suggest that this anode might be tried for use in cathodic protection of structures in seawater.

The electronic structures of aniline and its halogenated and methylated derivatives, N-phenylyl dodecyl amine and its methylated derivatives with substituents at different positions have been calculated by semiempirical method of Quantum Chemistry. The relation between the inhibitive efficiency of the above compounds in acid media for mild steel and their electronic structures has been discussed. A tentative interpretation is given for the phenomenon that when the inhibitors are substituted with the same kind of substituents at different positions in the molecule, or with different substituents at the same position, they exhibit different inhibitive efficiency. The mechanism of corrosion inhibition has been explained from the point of view of electron transfer. The information provided in this paper could be probably useful for developing new inhibitors of better quality.

The pitting initiation conditions and electrochemical techniques for measuring pitting induction time of stainless steels have been discussed in this paper. The authors also discussed the effects of environment and material factors on pitting induction time and compared the difference between potentiostatic and galvanostatic techniques. Finally, the results measured by these methods mentioned above were discussed on the basis of the reaction mechanism

The relationship between the numerical vaiues of the throwing power (T.P.) and the absolute geometric dimensions of Haring Cell was studied by theoretical analysis and experimental examination.Assuming that the current efficiency is equal to 100% on the two cathods, the relationship between the numerical values of T. P. and geometric dimensions of Haring Cell can be expressed in the following manner.T.P.=(For Haring-Blum's definition)T.P.=(For Heatley-Pan'sT.P.=(For Field's definition)T.P.=(For Luke's definition)These expressions show that the numerical values of T.P.depend on the ratio L_n/Lf and the distance of the nearer (or further) cathod to the common anode in the case of Haring-Blum's definition or Luke's definition and only depend on L_n in the case of Heatley-Pan's or Field's definitions.These conclusions were confirmed by experimental results o btained in the case of electroplating of silver from picolinic acid and cyanide systems.

The corrosion behavior of the stainless steel lining of the upper tube tank in the high pressure condenser was studied by meas of optical microscope, transmission electron microscope,scanning electron microscope and electron probe, and the causes of corrosion are discussed in this paper.Results of examination showed that two types, of corrosion, i. e., pitting corrosion and stress corrosion cracking, occurred on the 316L stainless steel lining under conditions of urea production. The microcracks of the stress corrosion cracking were initiated at the bottom of pits, aad the macro-cracks observed on the lining surface were in fact constituted by a serie s of pits that were close to one another.