The effects of alloying elements Sb（1 %）and Mn（0.5% and 1%）on the corrosion behaviour of Zn have been studied in 0.1 M NaCl and 0.1 M NaCl + 0.1 M Na2SO4 + 0.01 M NaHCO3 solutions by potentiodynamic polarizations, linear polarization, SEM investigations and XPS analysis. The results indicate that Sb presents only in the Sb-rich intermetallic particles. Compared with Zn matrix, the Sb-rich phases had no significant effect on both cathodic and anodic behaviour of Zn. Mn was found in both the Mn-rich intermetallic particles and the Zn matrix. Electrochemical measurements revealed that Mn in solid solution can reduce the oxygen reduction on Zn and had no significant effect on the anodic behaviour of Zn in 0.1M NaCl solution. In the simulated solution of marine environment (0.1 NaCl + 0.1 Na2SO4 + 0.01 M NaHCO3), 0.5%Mn can significantly increase the corrosion resistance of Zn through the mechanism that it can produce a more compact film and influence ion migration through the pores in the film.

Growth characteristics of Sulfate Reducing Bacteria (SRB) was tested. The SRB was in logarithmic-phase growth during the first three days and turn into stationary-phase growth since then. Atomic Force Microscopy (AFM) and Electrochemical Impedance Spectroscopy, respectively (EIS) have been used to investigate the effect of biofilm on phase boundary of HSn70-1 AB copper alloy and solution. The study using AFM showed that SRB cells adhered to the surface of copper alloy and the biofilm formed during three days immergence were observed. Roughness of three-day-old biofilm formed on the alloys was 44.7nm, while roughness of the biofilm decreased to 25.8nm after 14 days immergence. The simulative date of EIS spectrum revealed that transfer resistance (Re) of the electric double layer on the alloy surface increases with the immergence prolonged. Furthermore, capacitance value (Yp) of oxidation film on the alloy surface changed seriously, which indicated the structure of oxidation film was impacted.

An occluded corrosion cavity (OCC) cell which could simulate the auto-catalyzing process of localized corrosion was designed to study the under scales corrosion behavior of carbon steel in neutral NaCl solution in this paper. Electrochemical impedance spectroscopy (EIS) and linear polarization curves measurements were employed to study the variation of electrochemical behavior within the occluded anode. The result showed that the auto-catalyzing acidification process inside the OCC is exacerbated by corrosion products layer. A galvanic current produced obviously between the occluded anode and bulk cathode, the solution inside the OCC become more acid and the Cl- is centralized, occluded anode kept up activation dissolution, while the bulk cathode outside the OCC was partly or fully protected. The active dissolution in occluded anode is controlled by an irreversible charge transfer process at metal/oxide film interface. The charge transfer resistance and linear polarization resistance decrease with the short-circuited time continually. The occluded anode dissolution reaction was developed persistently by the occluded effect and become easier along with the short-circuited time continually.

Hot corrosions of a new nickel base superalloy DZ68 and DZ38G for directional solidification in the present of molten salt of 75% Na2SO4 + 25% NaCl in air at 900℃ were studied. The results showed that DZ68 had a more homogeneous microstructure by controlling segregation during solidification, So the hot corrosion of DZ68 was uniform and the oxide layer of DZ68 was much deeper. DZ38G had a small number of eutectic after heat treatment, its microstructure was non-uniform. The material loss of DZ38 was predominant by removal of oxide scale and severe corrosion pitting occurred in the DZ38G. The hot corrosions of DZ68 and DZ38G were the typeⅠ, but the processes of their hot corrosion were different for which they had different corrosion productions and microstructures. The all results account for the resistance of DZ68 is better than DZ38G even if the chromium content of DZ68 is lower than DZ38G.

The influence of stress ratio, loading frequency and additional stress on TGSCC initiation of X70 pipeline steel was mainly studied and ESEM observations of corrosion sample surfaces were carried out. The results showed that: low stress ratio increased the fluctuation of load, which facilitated the crack initiation of SCC of pipeline steel; the low frequency was in favor of initiation of TGSCC when the samples endured the same cycles of the fluctuating load; but the fast frequency was benefit to TGSCC initiation when the samples suffered the same time of the fluctuating load; and in our work no obvious effect of additional stress on the crack initiation was observed.

TiO2 thin film can be photo-induced super- hydrophilic and reverse to be hydrophobic after stored in the darkness for several weeks. A nano-TiO2 thin film was formed on pure titanium by thermal oxidation method .The component and microstructure of the TiO2 thin film was characterized by XRD and SEM methods.The relationship between the seawater corrosion and the hydrophobic properties of the TiO2 thin film was studied by EIS.

Two imidazolinyl intermediates are prepared from phenylacetic acid, α-naphthylacetic acid and diethylenetriamine firstly, and then they react with the solution of sodium chloroacetate into two imidazolinyl quaternary ammonium salts(PAIPI and NAIPI). Their influence on the inhibition of corrosion of A3 steel in 1 mol/L HCl solution is studied by weight loss and electrochemical techniques. The obtained results show that the two compounds are good inhibitors for A3 steel in 1 mol/L HCl . But the inhibition efficiency of NAIPI is better than PAIPI and Two imidazolinyl quaternary ammonium salts are anode-type corrosion inhibitors. The adsorption of two imidazolinyl quaternary ammonium salts on A3 steel is studied from the results of the electrochemical technique, and the experimental results reveal that adsorption of two imidazolinyl quaternary ammonium salts on A3 steel surface is monolayer and belongs to physical absorption.

The structure of poly (methyl methacrylate)/ montmorillonite (PMMA/MMT) nanocomposites was characterized by means of XRD and TEM. The sulfuric acid corrosion behavior of PMMA/MMT nanocomposites were studied using weight loss testing method, and the corrosion products were analyzed by FTIR and XPS. The solutions show that，exfoliated PMMA/MMT nanocomposites is made, and the corrosion rate of composites is 34.2 percent to PMMA when the mass fraction of MMT reaches 3 %. The corrosion products of both PMMA and its composites are C, H, O and S. Compared with the corrosion product of pure PMMA, C element content of the corrosion product of PMMA/ 3wt% MMT nanocomposites decreases while S and O elements increase introduced by the weaker of the degradation behavior of PMMA matrix for the barrier effect of MMT layer.

The formation of corrosion products on the surface of Q235 steel in seawater containing sulfate-reducing bacteria(SRB) was studied by scanning electronic microscopy(SEM), electronic probe microanalyzer(EPMA) and transmission electron microscopy(TEM) combined with energy dispersive X-ray detector(EDX) in this paper. SEM observation showed that the corrosion commenced with the attachment of bacteria to the steel surface, producing organic acids, hydrogen sulphide and extracellular polymer substances(EPS). Globules of hydrated ferric oxide were the primary form of corrosion products. With exposure to further deterioration caused by SRB, their transformation to spongy globules of iron sulphide was observed by EPMA. The presence of single crystal FeS in the corrosion products was identified by electronic diffraction pattern of TEM and composition analysis by EDX.

Pulse electrodeposition was used to produce the zinc coatings with different grain sizes by changing the peak current density and the additives. The corrosion behaviors of zinc coatings in 3.5% NaCl solution were investigated by potentiodynamic polarization and EIS techniques. The results demonstrated clearly the better corrosion resistance of nanocrystalline zinc coatings compared with conventional coarse-grain zinc coatings. The structure and the crystal orientation had also a significant influence on the corrosion resistance of zinc coatings.

The corrosion behavior of Ni-P deposit on W-Cu alloy in 3.5%(wt%) NaCl solution was tested by the polarization curves and electrochemical impedance spectroscopy (EIS). The results indicate that the passive region is not obvious after immersing in 3.5%(wt%) NaCl solution for 0.5 hour and with the increasing of the immersion time the passive membrane becomes integrated and the passive region is becoming obvious after immersing in 3.5%(wt%) NaCl solution for 2 days. After 6 days the point corrosion potential and passive region become smaller and its anti-corrosion ability is getting lower, but the passive parameter is better than that of W-Cu alloy. The polarization curves after immersing in 3.5%(wt%) NaCl solution for 13 days and 29 days were much the same as the one after 6 days and the corrosion behavior of Ni-P alloy in 3.5%(wt%) NaCl solution becomes stable.

The light and heat intensifying efficiency of Sun tracking energy concentrated natural accelerated test was analyzed. Three different kinds of acrylic acid coatings were tested in Jiangjin hot and humid environment facing 45°south and with the Sun tracking energy concentrated natural accelerated device. The correlativity of these two kinds of test methods was studied from simulation and acceleration performance. It was concluded the simulation performance is good and the acceleration can achieve 3 times in the strong solar radiation season of Jiangjin.

The current status of the study on the surface treatment technology for magnesium alloys is reviewed. The topics covered include chemical conversion, self-assembled monomolecular, anodizing, electroplating and chemical plating, liquid phase deposition and sol-gel coating, thermal spray coating, physical vapor deposition, laser cladding alloy. And the development tendency of the surface treatment technology for magnesium alloys is presented at the end of this paper.