Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract: Effect of pre-treatment processes including acid pickling and acid pickling plus alkaline cleaning on the corrosion resistance of achromium-free zirconate-titanate based conversion coating on AZ91D magnesium alloy was systematically investigated. The results indicated that the acid pickling could induce the preferential dissolution of α phase and thereby increase the surface roughness of AZ91D magnesium alloy, but which was not conductive to the enhancement of the corrosion resistance of the conversion coating. However, the acid pickling plus alkaline cleaning could appropriately modulate the surface chemical state of AZ91D magnesium alloy, and therefore effectively improve the corrosion resistance of the zirconate-titanate based conversion coating.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract: none
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract: Galvanostatic pulse measurement (GPM) was introduced as a new non-destructive technique to monitor corrosion of X80 pipeline steel in a red soil environment. Corrosion rate and double layer capacitance of the metal/soil interface for X80 pipeline steel in red soil were measured by GPM, and then the acquired data were compared with those measured by polarization method. Results show that the galvanostatic pulse method is applicable for monitoring soil corrosion of the steel and it can provide a nondestructive analytical probe into double layer characteristics at soil/steel interface. The polarization resistance measurement indicated that corrosion rate of the steel decreased with time in the water saturated red soil.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract: Corrosion behavior of 16MnR low alloy steel in KOH solutions was studied by means of electrochemical measurement. Results show that with the increase of KOH concentration, the corrosion potential and polarization resistance (Rp) decreased, while the corrosion current density and the passivation current density increased, thus the corrosion rate of 16MnR increased correspondingly. After immersion test the steel exhibited surface morphology with severe corrosion characters and its main corrosion product was Fe2O3.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《材料研究学报》
Abstract: Bi4Ti3O12/SiO2 photocatalytic material coated quartz sand was prepared by sol-gel method. The effect of deposition process on physical property and photocatalytic activity of the deposited Bi4Ti3O12 were studied. The deposited Bi4Ti3O12 shows a layered perovskite structure on the surface of the amorphous quartz sand. Whlie the deposition process does not alter the electron binding energies of the deposited Bi4Ti3O12. The adsorption of reactive brilliant red X-3B on pure Bi4Ti3O12 and xBi4Ti3O12/SiO2 with different deposited among χ is not more than 3%. Photocatalytic activity of the deposited Bi4Ti3O12 is enhanced, among others the Bi4Ti3O12/SiO2 with 50 mass% Bi4Ti3O12 has the maximum activity. The rate constants of photocatalytic reactions for Bi4Ti3O12 and 50%Bi4Ti3O12/SiO2 are 0.021 s- 1 and 0.027 s- 1 respectively.