The electrode system for real-time electrochemical measurement of immersed samples were designed and applied at a marine corrosion test station in Zhoushan of China. Polarization resistance measurement and Electrochemical Impedance Spectroscopy (EIS) were used to monitor four carbon steel and low alloy steel coupons during the different period of exposure in seawater. The measuring results reflected the corrosion performance of the samples in different period and the influence of seawater conditions. The polarization resistance changed because the rust was deposited on the samples surface and the seawater temperature changing. EIS proves to be qualified in measuring the metal samples exposed in seawater, which also reflects the corrosion mechanism of the samples during exposure. The electrochemical measuring results were approximately consistent with the lost weight data exposed in seawater for one year.

By means of naturally burying and testing metal specimen seasonally, testing soil environment factors such as temperature, humidity, salinity and conductance every half a month, the rule of cable metal materials’ ( Pb, Al and Cu) corrosion rate varying with the seasonal changing of soil environment factors within one year in Yingtan was studied. The testing result indicated that there was relativity between Pb, Al and Cu corrosion rate during different burying periods and the varying of soil environment. The maximum corrosion rate occurred when spring and summer alternated (from April to July) when the soil environment factors altered severely. The corrosion rate of Pb which was the highest among the three kind of metals was 11 times of that of Al and 3 times of that of Cu as Pb was affected by pH of acid soil, dissolvable salinity (No3—，CO32- and HCO3－) and soil animalcule.

The Cu/Sn63-Pb37 galvanic couple appeared in most electronic devices. This paper was to investigate the corrosion characteristics and mechanisms of this couple, which was exposed in the typically simulated air condition at 40?C with 95%RH. The in-situ electrochemical information of the couple have been performed with related zero resistance ampere techniques under thin moisture film. According to the time dependent features of galvanic potential and anodic galvanic current density results, the Cu acted as anode and the Sn63-Pb37 acted as cathode during exposure. The gradual formed corrosion products, which were detected by FT-IR and XRD, restrained the anodic polarization behavior occurring on Cu surface. The hydrolyzed CO2 on the Sn63-Pb37 surface induced the breakdown of Pb oxides formed in air naturally, which was confirmed from the SEM surface morphologies. Despite the exact corrosion rates was not obtained from the galvanic current density data, the changing trend were valuable for estimating the atmospheric corrosion behavior of the Cu/Sn63-Pb37 couple.

The Corrosion features on the joint section of aircraft Aluminum alloy structure were expounded briefly. The corrosion behaviors on the joint section of aircraft aluminium alloy structure painted coating were studied using the accelerated corrosion environment spectrum testing method. The corrosion damage course was reproduced and the corrosion growth laws were brought to light under the laboratory condition.

In the simulating the environment of CO2 corrosion in oilfield, XRD and SEM techniques were adopted to study the formation and development of CO2 corrosion product film on X65 steel. The results demonstrated that the corrosion scales are three layers in the cross-section. Structural characteristics and formation mechanism of the film were discussed respectively.

The growth characterization for sulfate reducing bacteria (SRB) under anaerobic condition was studied. Measurements of corrosion potential and the polarization resistance were used to investigate the electrochemical behavior of HSn-70-1AB and BFe30-1-1copper alloys in medium containing sulfate reducing bacteria. The results shows that the biological corrosion of copper alloys is closely related to growth characterization of SRB. The corrosion potential and the polarization resistance of electrode for copper alloys drastically moved toward negative direction as the SRB was in the logarithm growth stage. While both of them would slowly drop down as SRB entered into stable growth stage. Scanning electron Microscopy and X-ray diffraction were respectively used to analyze the morphology and chemical composition of the biofilm. The results showed that biofilm characterization formed on the copper alloys were totally different.

The interactions between corrosion inhibitors, i.e. benzotriazole (BTA), methyl of carboxybenzotriazole (CBTAH-ME), butyl of carboxybenzotriazole (CBTAH-BU), octyl of carboxybenzotriazole (CBTAH-OC) and Cu2O crystal have been simulated by molecular dynamics (MD). Results show that the order of binding energies of corrosion inhibitors with Cu2O crystal is as follows: CBTAH-OC>CBTAH-BU>CBTAH-ME>BTA. The analysis of various interactions and pair correlation functions of all systems indicates that binding energies are mainly determined by coulomb interaction. Benzotriazole and its derivatives are deformed during their combining with the (001) face of Cu2O crystal, and coordination bonds are formed between the copper atoms in Cu2O crystal and the nitrogen atoms in corrosion inhibitors.

An investigation of the stress corrosion cracking resistance of high strength aluminum alloys 2A12 and 7A04 in different atmospheric environment were presented, results were compared with those obtained in laboratory accelerated tests. C-ring and direct tension stress corrosion specimens were taken from the short transverse grain and the longitudinal direction of aluminum alloy stick respectively, applied stress level were 60, 70, 80 and 90 percent of the σ0.2. The atmospheric stress corrosion tests were exposed to three different atmospheric test stations in China, one in Beijing, typical semi-rural atmosphere, others in coastal city, Qingdao (East of China) and Wanning (South of China). In the meantime, alternate immersion and direct tension stress corrosion immersion in salt solution were conducted in laboratory condition. The results showed that SCC performance of aluminum alloys could be evaluated within one year in marine atmospheric environment, otherwise, only exfoliation corrosion or pitting was observed. The alternate corrosion results showed that SCC of aluminum alloy was consistent with outdoor exposed samples in the marine atmospheric environment.

A novel centrifugal compaction method was used to fabricate Al2O3/Ni functionally gradient composites without macro-interface. The slurry preparation, centrifugal compaction mechanism and mechanical properties of the composites were investigated. The results show that slurry with good fluidity can be produced when the binder content, solid content and milling time is 2wt.%, 63vol.% and 36h, respectively. Greenbodies of the Al2O3/Ni functionally gradient composites without macro-interface were fabricated by centrifugal casting (3000 r/min for 40min). Al2O3/Ni functionally gradient composites were produced by vacuum sintering at 1400 C for 2 hours. Through adjusting the solid and binder content, the composition gradient in Al2O3/Ni composites can be controlled.

The development and the applying situation of weathering steel and progress in research on weathering steel were reviewed in the work. The effect of alloy element such as Cu, P, Cr, Ni on the corrosion resistance of weathering steel and its mechanisms were summarized as well. At the same time, it was analyzed that the process and the mechanisms of rut layer transformation and revolution. A better prospect of weathering steel development is described. It was concluded that the good performance of weathering steel resistance to corrosion came from the additions of alloy elements. The inner rust layer formed on the weathering steel is constituted mainly by compact α-FeOOH after lots of year exposure. The transformation of γ-FeOOH to α-FeOOH is a reason for the good property of weathering steel resistance to corrosion.

Thiobacilli corrosion is often a problem in sewer environment. The research progresses of thiobacilli on concrete corrosion in recent years were reviewed. It’s concluded that the research done on thiobacilli corrosion of concrete can roughly be divided into two groups: bacteria simulation tests and exposure tests in situ .The corrosion mechanism of concrete induced by thiobacilli and the distinction between sulfuric acid corrosion and thiobacilli corrosion were explained. In addition, the parameters which were used to evaluate the concrete’s corrosion degree and the methods which were used to improve the concrete’s durability were also concluded. The conclusions as following are made at the end: Though some advances had been made so far, there are a lot of void in the study of concrete corrosion resulted from thiobacilli. Especially the grading of the corrosion, the models for predicting corrosion rate, the relationship between substratum and the bacteria responsible for the production of the sulfuric acid and whether can utilize the bacteria to improve the concrete’s durability or not should be intensified as soon as possible.