The present paper summarized the influence of zinc injection on the growth cha-racteristics of oxide scale, radiation field and stress corrosion cracking of structural materials in waters for light water reactors (LWRs), as well as the related mechanisms. The progress in electrochemical study on Zn-injected water chemistry (ZWC) was also introduced.  The possible research topics and directions for the future were proposed.

The electrochemical corrosion behavior of bulk nanocrystalline ingot iron (BNII) with grain size 38.9~87.5 nm and conventional polycrystalline ingot iron (CPII) with a mean grain size 50 μm in 0.4 mol/L hydrochloric acid solution is investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements at ambient temperature. The results show that E _corr (open circuit corrosion potential) of BNII is 43 mV more positive than that of CPII. The I_corr (corrosion current density) decreases from 68.37 μA•cm^-2of CPII down to 29.55 μA•cm^-2 of BNII. The charge transfer resistance, R_t increases from 427.0 Ω•cm^-2 of CPII up to 890.1 Ω•cm^-2 of BNII. The scanning electrode microscopy (SEM) observation shows that pitting scarcely presented on bulk nanocrystalline ingot iron. Therefore the corrosion resistance of bulk nanocrystalline ingot iron is improved in comparison with the conventional polycrystalline ingot iron in hydrochloric acid solution.

The high temperature oxidation behavior of a new nickel-based superalloy was investigated at 850℃ and 950℃ in air by means of TGA, XRD and SEM/EDX. The results show that oxidation kinetics basically obeys parabolic law. The formed oxide scale is consisted of three layers at 850℃ and 950℃.The outer layer is mainly composed of complex oxides and spinals, and the middle one is a continuous layer and finally the inner one is a dis-continuous layer of Al₂O₃. The out layer is rich in Ta, which may suppress the diffusion rate of Al. As a result, a continuous oxide layer of Al₂O₃ is formed in the middle of the scale to restrain the growth of oxide scale and decrease the oxidation rate.

The chemical constituent of corrosion product scale on 29Cr super duplex stainless cast steel  after electrochemical polarization in artificial seawater was studied by X-ray photoelectron spectroscopy in this paper. The results indicate that the corrosion is mainly pitting corrosion; MoO^2-4, NH₄⁺ and a small amount of NO^-₃ absorbed on the surface of the passive film so that to enhance the protectiveness of the layer. The outer portion of passive film of 29Cr super duplex stainless steel is mainly composed of hydroxide type compounds such as Cr(OH)₃, FeOOH and oxides such as Cr₂O₃, Fe₃O₄, FeO, Fe₂O₃, MoO₂, MoO₃ and NiO, but its inner portion is mainly composed of abundant metallic elements of Fe, Cr, Ni, Mo and oxides including Cr₂O₃, Fe₃O₄, FeO, MoO₂, NiO and some nitride such as Cr₂N. During the passivation process, Cr₂N tends to enrich at the passive film surface, thereby its pitting corrosion resistance may be enhanced.

For better understanding the effect of microcrystallization on corrosion performance of pure magnesium, the corrosion behavior of pure microcrystalline (MC) magnesium had been studied by means of anodic polarization curves and Mott-Schottky measurement in comparison with its counterpart cast magnesium. The experimental results indicated that microcrystallization had an obvious effect on the corrosion behavior of pure magnesium. In comparison with the cast magnesium, the passive film on the MC magnesium showed different growth mechanism and superior corrosion resistance to pitting corrosion, which might be resulted from lower point defect density and point defect diffusivity of the passive film.

The effect of Cu content on corrosion resistance of a Cr containing high strength low alloy weathering steel was studied by cyclic wet-dry test, which was designed to simulate the real atmospheric corrosion. The corrosion depth, distribution of elements and phase constituents of corrosion product were characterized by SEM and XRD. Based on the experimental results, it can be found that when the Cu content is low, the formed rust scale could not prevent the substrate from further corrosion because the scale were fragile and easily stripped from the substrate surface, which is believed to result in the increase of weight loss of the steels. The weight loss due to corrosion decreased sharply with the increasing of Cu content of the steels and the formed rust scale became thinner and much compact due to the enrichment of Cu and Cr on the inner portion of the rust scale.

The corrosion behavior of reinforced steel in simulated concrete pore solutions with chloride and different pH values was studied by electrochemical methods. Stationary and transient electrochemical methods, such as linear polarization resistance (LPR), electrochemical impedance spectroscopy (EIS) and galvanostatic pulse measurement (GPM) were reviewed, and the obtained polarization resistances by means of different methods in different simulated concrete pore solutions were comparatively analyzed. The results indicate that the polarization resistances obtained by these methods are similar and comparable, which means these methods can give a reliable assessment on reinforced steel corrosion.

The effect of polycarboxylic and naphthalene superplasticizer on the corrosion behavior of rebar steel in simulated concrete pore solutions and concrete was studied by electrochemical techniques. The results indicated that two kinds of water reducer have little effect on the corrosion inhibition of rebar steel in the simulated concrete pore solutions. However, the decrease of corrosion rate of the rebar within reinforced concrete may be resulted from the decrease of porosity and the increase of density of the concrete due to the addition of proper amount of water reducer. It was found that the addition of polycarboxylic type water-reducer in a range of  0.1% to 0.3% was more effective than that of 0.2% naphthalene water reducer in reducing the corrosion rate of reinforcing steels within reinforced concrete immersed in 2.5 mol/L sodium chloride solution. The mechanism of this phenomenon was preliminarily discussed.

Cr/TiN/Ti nanocrystalline composite films of about 3 μm were deposited on titanium bipolar plates for proton exchange membrane fuel cell (PEMFC) by hollow cathode deposition (HCD) ion plating. The electrical contact resistance of Ti plate with and without the nanocrystalline films was tested respectively, and their electrochemical corrosion performance was evaluated in 0.05 mol/L H₂SO₄+2 mg/L NaF solutions bubbled with H₂ or O₂ at 60℃ by means of polarization measurements. The results show that the contact resistance of the coated Ti plate was obviously lower than that of bare Ti plate, with about 12 mΩ•cm² under a compressive presure 1000 N/cm². The passivation current density of the coated Ti plate was one order of magnitude smaller than that of the bare Ti plate under the condition of charging hydrogen, suggesting that the corrosion resistance of titanium bipolar plate is greatly improved by the deposition of Cr/TiN/Ti nanocrystalline composite films.

The corrosion inhibition of benzimidazole (BIM) on brass in 3% NaCl solution at 30℃ was investigated by Tafel polarization curve and electrochemical impedance spectroscopy (EIS). The results indicated that BIM has certain inhibition ability and the best inhibition efficiency was 93.3% for a dose of 0.4 g/L. Furthermore, the adsorption behavior of BIM on brass at 75℃ was also studied by means of curve fitting and electrochemical test. The result shows that the adsorption of BIM on brass followed Langmuir isotherm, the adsorption process was spontaneous and belonged to physical adsorption.

A prerequisite is of proper corrosion performance for the aluminum foil mesh, which is an important component of the composite of aluminum foil mesh/carbon fiber reinforced polymer (CFRP) for aircraft. For enhancing its corrosion resistance, the aluminum foil mesh was anodized in solutions of phosphoric acid. The anodizing parameters were optimized by electrochemical polarization measurements. The environmental corrosion resistance of the anodized aluminum foil mesh and the composite with intercalation of aluminum foil mesh conducting layer was also examined. The result showed that: a porous film was formed on the surface of the anodized aluminum foil mesh, and it improved obviously the corrosion resistance of aluminum foil mesh. The shear strength of lap joint of composites aluminum foil mesh/carbon fiber reinforced polymer (CFRP) declined along with the corrosion time. The shear strength of lap joint of the composites intercalated with anodized aluminum foil mesh was better than that with bare aluminum foil mesh.

The electrochemical corrosion of copper in KCl solution has been studied by cyclic voltammetry and in situ  IR spectroelectrochemistry, but the relevant kinetic and mechanism were still kept unknown. In the present paper, the corrosion kinetics was studied by means of cellular automat simulation on PC computer with SCILAB program. The simulation results are correlated well with the experimental data. The total corrosion dynamic curve follows a Weibull function in the short corrosion time(<200 s), and a Hoerl function in the longer corrosion time(>200 s), which is similar to the cellular automat simulation results in the literature.  Based on the experimental, theoretical and simulation results, the mechanism of the corrosion process was suggested, which offers a new way to understand the process.

The buried coupon tests along the 4000 km East-West Gas Pipeline were described, as well as the in-situ measurements on buried coupons by DIY instrument. According to the measured AC potential of pipeline and the currents of coupons to pipeline, the AC and DC electric interference was analyzed along the whole pipeline, respectively. In additions, the possibility of evaluation of the protective degree of the applied cathodic protection on the pipeline by true potential (minus IR drop) was discussed under generic electric interference.

Orthogonal experiments were conducted to find out the optimal process for electroless plating of Ni-W-P coatings. Deposition rate and corrosion resistance were taken as the index for performance assessment. The optimal process is that a solution consisted of NiSO₄•6H₂O 30 g/L, Na₂H₂PO₂•H₂O 25---30 g/L, Na₂WO₄•2H₂O 50 g/L, Na₃C₆H₅O₇•2H₂O 75 g/L, lactic acid 15 mL/L, (NH₄)₂SO₄ 30 g/L and additive 20 mg/L with pH9.0 at temperature (90±2)℃. The corrosion performance of coatings were evaluated by electrochemical tests. The results indicated that the corrosion performance of Ni-W-P coating was superior to Ni-P coating. The corrosion resistance of Ni-W-P coating may be further improved after a proper high temperature heat-treatment. According to the scanning electron microscopy images and X-ray diffraction patterns, after heat treatment there exist an interdiffusion zone between Ni-W-P coating and substrate steel, whilst a compact oxide scale also formed on the surface of the coating, which are considered to be beneficial to the enhancement for the adhesion and corrosion resistance of the coatings.

To deeply understand pretreatment process of AZ91D magnesium alloy for copper electroplating, the major factors which influence the pickling-activation and zincifying of magnesium alloy AZ91D were investigated by electrochemical measurement and scanning electron microscopy (SEM). The results show that the composition of pickling-activation bath has considerable influence on the surface roughness of AZ91D magnesium alloy. The pickling-activation effectiveness of a compound (C₂H₂O₄•2H₂O+NaF) bath is better than that of single (C₂H₂O₄•2H₂O) bath. The appropriate temperature of pickling-activation is room temperature. The optimal formula of picking-activation is 12 g/L C₂H₂O₄•2H₂O, 50 g/L NaF, T=25---35℃, t=60---300 s. The presence of both NaF and Na₂CO₃ could have considerable influence on the open circuit potential (OCP) and the surface morphology of magnesium alloy AZ91D for zincifying. The zincifying film obtained  in a zincifying bath with continuously varied temperatures was better than that with a consistent temperature. The optimal temperature regime varied continuously from 30℃ to 40℃. The appropriate immersion time of zincifying is 10~15 min.