Before fluorescence detection of Titanium alloy components, acid pickling in HF-HNO3 solutions is always required in order to remove the superficial oxides of the components. According to the relative CPS document, the conditions for Titanium alloy pickling are HF arranged below 90g/L, HNO3 300-450g/L and at ambient temperature. In this paper, the corrosion rate of the acid pickling process of TC4 alloy was investigated using the acid solutions with variable HF、Titanium contents and fixed HNO3 content of 375g/L at different temperatures. In addition, the intergranular corrosion and pitting corrosion of the TC4 alloys after pickling under different conditions were conducted. The effects of HF and HNO3 on the intergranular corrosion and pitting corrosion were discussed.

Summary Sprouting negatively impacts wheat processing and edibility. Sprouted wheat flour (SWF) was air‐classified into three categories based on particle sizes, F1 (>45 μm), F2 (20–45 μm), and F3 (<20 μm). The sizes were examined using a laser particle size analyser and scanning electron microscopy. Their components, such as starch, protein properties, rheology, and dough microstructure, were also examined. After air classification, reducing sugar, damaged starch, amylase, protease, and inferior gluten components were primarily concentrated in F3. Decreasing particle size considerably impaired gelation strength, gluten quality, rheology properties, and dough microstructure. Compared with SWF, these characteristics significantly improved in F1. The results suggested that air classification could induce SWF component fractionation. The inferior components that reduce the quality of SWF were enriched in fine flour. Thus, removing these inferior components can considerably improve SWF rheological quality and dough structure. These results can provide useful information on the important effect of air classification on the quality of SWF products. Moreover, the study findings provide a reference for future application of air classification of SWF.

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Abstract. In this paper, Al coatings were deposited on the TC4 Titanium alloy by arc ion plating, and hence the Al coatings were micro-arc oxidized (MAO) in the solution of Na2SiO3 + (NaPO3)6 for 20min, 60min and 90min, respectively. The microstructure and oxidation behavior at 700 o C in air for 100 h were investigated by SEM/EDS, XRD and electric balance. The results show that with the increase of MAO treated time, the acquired scales became coarser, and their main composition was rich in Al2O3. After the 10 hours of the initial oxidation at 700 o C in air, obvious peeled scales were appeared on the samples of MAO treated for 20 min and 90min. After oxidation for 40 h, the samples of MAO treated for 60 min occurred mass lose. The oxidation mechanism of the MAO treated TC4 alloy was discussed.

Abstract. In this paper, the mechanical attrition(MA) was supplied in a traditional electroplating process by rolling movement of different diameter of glass balls in the acid copper plating electrolyte to study the effects of different diameters of the glass balls on microstructure of copper plating and the properties of carbon-impervious, grain refine and corrosion resistance. The results showed that the grain size of the plating had obviously decreased in the MA process, and with increasing the diameters of the glass balls, the porosity, corrosion resistance and the properties of carbon-impervious of the plating were first increased and then decreased.