Some neodoxy and innovation on corrosion prediction in a newly published homonymic treatise are partly introduced, including the understanding of corrosion, quantization express, characteristics of corrosion data, treatment and analysis, modeling and prediction, error analysis, proof-test and so on. Thereinto，fractal methods and the prediction based on poor-information system may have broad application foreground in corrosion science.

Corrosion performance of Sn-Ag, Sn-Cu, Sn-Ag-Cu and Sn-Zn lead-free solders are examined in this paper. The previous investigations were only focused on the solder itself, however, during the soldering process the solder was melted and then solidified. Compared to original solder material, the microstructure and chemistry of the solidified solder may change, which will affect the corrosion behavior of the solder during service in aggressive environment. So the investigation in the future should focus on the corrosion behavior of the solder joint used in aggressive environment.

Anodic oxidation can greatly enhance the corrosion resistance of magnesium alloy. The constituents of electrolyte are vital for the protective properties of anodic coatings of magnesium alloys. In this paper, the study about the electrolyte constituents for the anodizing treatment of magnesium alloy is reviewed in order to lay foundations for them research of anodizing techniques of magnesium alloys.

Corrosion failure features of intergranular attack and hydrogen brittleness were generalized through analysis and sum-up on corrosion failure cases of pressure vessels and pipelines and the existing failure information. COM Wizard, data base technique, and reliability engineering were applied to construct an effective corrosion failure diagnosis expert system. Corrosion failure modes of real cases were analyzed in the expert system through the corrosion failure features input and the results were listed by general certainty as the evaluation parameter.

Cassava starch graft acryl amide copolymer (SGA) was prepared by grafting acryl amide onto starch with oxidization reduction reaction, which can be used as a good environmentally-friendly “green” inhibitor. The inhibition effect of SGA on the corrosion of cold rolled steel (CRS) in 1.0 mol/L HCl has been studied by weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and scanning electron microscope (SEM) methods. The results show that SGA is a good inhibitor in 1.0 mol/L HCl for CRS, and the adsorption of SGA on the CRS surface obeys Langmuir adsorption isotherm. Polarization curves show that SGA is a mixed-type inhibitor in hydrochloric acid. All EIS spectra exhibit one capacitive loop, and the charge transfer resistance increases with the inhibitor concentration. SEM results show that the introduction of SGA into HCl solution results in the formation of a compact and dense inhibitive film on the CRS surface.

Mass loss tests were performed for carbon steel corrosion induced by alternating current，as well as the measurement of polarization curves under AC interference. The results show that the AC corrosion rate of carbon steel follows a power function with the AC interference intensity within AC current density 0~250 A/m², which concerned in this paper. The effect of AC interference on the polarization curves (1) decreasing the surface reaction resistance, and (2) decreasing both of the anodic and cathodic Tafel slopes. Thereby, the AC corrosion characteristics and rules were well explained and the AC corrosion mechanism was also discussed.

The effect of cyclic pressure on the degradation behavior of the epoxy coating on carbon steel surface in 3.5% NaCl solution in a simulated deep-ocean environment was studied using electrochemical impedance spectroscopy (EIS) and weight method. The results showed that the EIS characteristics displayed a periodic variation under the cyclic pressure condition. The coating capacitance at high pressure was higher and the coating resistance was lower than that at atmospheric pressure during immersion periods, respectively. With increasing the cyclic pressure, the corrosion medium such as water had diffused to the coating/metal interface more easily. As a result, the increase of the water absorption capacity of the epoxy coating and the decrease of coating resistance were observed. The coating protection properties were obviously deteriorated.

In this paper, based on the analysis to surface microstructure of FSW AA2024 joint, the corrosion evolution behavior was revealed by a quasi-in-situ observation method. Besides, the corrosion mechanism of the FSW joint was investigated by combining TEM, DSC and electrochemical analysis. The results show that FSW makes the corrosion resistance decrease, which is characterized by the facts that the most corrosion in the SAZ (shoulder active zone) and the pitting corrosion initially originates in dissolving of the $S$ phase (Al₂CuMg). TEM observations indicate that crystal defects density increases in the welded joints causing the more different electrochemical properties between grains and grain boundaries. The S phase particles are broken and partially redissolved during the FSW process in the SAZ. When the corrosion happens, the broken S phase particles increase the pitting corrosion density of the SAZ. In addition, the activity of the SAZ is enhanced due to the doped Mg.

Evaluated and compared with the corrosion resistance of 20 & 08 carbon steels by electrochemical and immersion experiments. It can be seen that the corrosion resistance of 08 carbon steel is greater than 20 carbon steel from the experiment results. More and more Cl^- which properly accumulated on the surface of pipeline and hard to diffuse from the steel when the water layer formed on the surface of metal become thicker, and then corrosion problem got worse. The content of Cr in 08 carbon steel is higher than 20 carbon steel which is properly reason why the corrosion resistance of 08 carbon steel is better than 20 carbon steel

Bacterial adhesion and biofilm formation on the surface of carbon steel are common in seawater. The heterogeneous biofilm and the associated bacteria form complex biological systems that impact the physical and chemical characters of the metal/biofilm interface, such as pH, dissolved oxygen, chloride and sulfate, etc., and change the corrosion mechanism of carbon steel. Accordingly, it is important to investigate the bacteria composition in the corrosion product of carbon steel. In this work, the bacteria compositions in the corrosion product of different carbon steel emerged in seawater for different periods were researched by bacteria isolating and identifying methods. The results show that the contents of aerobe and facultative anaerobe reach the maximum value when the corrosion time is 91 d. However, the content of sulfate reducing bacteria reaches the maximum value when the corrosion time is 184 d. The contents of iron bacteria and sulfur bacteria change irregularly. For different carbon steel, except 7 d corrosion time, the contents of aerobe and facultative anaerobe in biofilm increase with increasing the content of carbon, but that of sulfate reducing bacteria descends. Aerobe and facultative anaerobe mainly compose pseudomonas and vibrio. When the corrosion time is 365 d, flavobacterium also exists in the corrosion product. The aerobe is predominant in the initial stage of experiment and facultative anaerobe is predominant in later stage. The major composition of iron bacteria includes naumanniella and siderocapsa. The different bacteria produce the different metabolic products that influence corrosion process of carbon steel.

Based on interdigitated comb electrodes capacitor sensor and impedance spectroscopy technology, a new oil corrosion measurement technique as well as the instrument were developed. The new electrode and the associated instrument is applied to copper strip corrosion test (GB/T5096-90) of jet fuel. The results show that the new corrosion detection technology is better than that obtained by conventional oil corrosion measurement.

Adsorption behavior of an imidazoline inhibitor (MA) on carbon steel in CO₂ saturated 1% NaCl solution is studied by potentiodynamic polarization curves. The thermodynamic parameters are calculated and the adsorption isotherm is also discussed. The results show that MA is of mixed adsorption and its inhibition efficiencies increased with the increasing of MA concentration and decreased with the increasing of temperature. The adsorption of MA meets the El-Awady thermodynamic kinetic model, and is in line with the Flory-Huggins isotherm.

Some characteristics of concrete (such as impact load-indentation relation, impact indentation stress-strain relation and abrasion), eroded by ammonium sulfate solution with pH value of 2.54, were studied by means of sphere impact method. Other physical quantities, such as compressive strength，expansion of damage zone，change of mass and the variety of pH value for solution, were also investigated. The test results indicate that (1) the velocity of abrasion，damage and local deformation for sphere was quicker than that of load; (2) compressive strength of concrete soaked in ammonium sulfate with pH value of 2.54 did not decrease in a certain period of time, whereas the alkaline environment was destroyed by these erosive medium. The conclusion is that ammonium sulfate solution with H⁺  did not destroy the macro-mechanical property but surface mechanical property was achieved.

In order to enhance the properties of electroless Ni-B, the changes in morphology and performance of electroless Ni-B alloy was studied by changing the contents of reducing agent and adding quantitative sodium acetate. The reasons of the morphology and performance of the electroless Ni-B were improved while adding sodium acetate 12 g/L are analyzed based on crystal structure, coating morphology, hardness, wear curves. It was found that sodium acetate as a buffer can reduce the deposition rate of the chemical plating Ni-B, increase the density of the chemical plating Ni-B, and improve the quality of coating in the process

Dense, well adherent and silvery bright aluminum coating was obtained on iron substrates from 2AlCl₃/[bmim]Cl ionic liquids contained of a small amount of toluene at various cathode current densities. Cyclic voltammogram show that the deposition is obtained owing to the reduction of Al₂Cl₇ ^- which has a peak value of -0.34 V; The maximal current efficiency of 97% is obtained when current density is 20 mA/cm². The thickness of aluminum coating increases with prolongation of plating time and the increase of cathode current density when it is less than 35 mA/cm². The results investigated by SEM and DES show that the aluminum electrodeposits obtained on Fe electrodes were dense, continuous and higher purity at 45±2℃ temperature. When the current density is 20 mA/cm², the aluminum is deposited in a flaky form, with the increasing of the current density, the form of the aluminum layer changes from flake to graininess, and at the same time, the size of the grains decreases.

Nano-titanium fluorinated polyaryletherketone copolymer was prepared from nano-titanium precursor oligomer and nano-alumina modified fluorine-containing polyaryletherketone polymer. This material was used to prepare nano-titanium polymer alloy coating to protect the metal from corrosion. The microstructures of nano-titanium precursor oligomer and nano-titanium fluorinated polyaryletherketone copolymer were characterized by transmission electron microscope(TEM) and infrared spectrometer(IR). Moreover, the anti-corrosion capabilities of the alloy coating were examined under severe environmental conditions. The results show that the pipe with the alloy coating can work well in simulated oil and gas environment for long time, which proves that such an alloy coating is really a good anti-corrosion coating.