Study On Cathodic Protection Of 304 Stainless Steel By Photo-electrochemistry And Triboelectric Nanogeneration

Metal corrosion is not only a shortcoming that limits its own development,but also directly and indirectly causes many problems such as waste of energy,waste of resources,economic loss,and safety.As a new type of corrosion protection method,photocathodic protection technology and triboelectric nanogeneration cathodic protection technology have huge application potential.As the research continues to advance,these two technologies have exposed many scientific problems.ln this dissertation,two photocathodic protection systems using Ni3S2/TiO₂ and Ni₂P/TiO₂nanostructure materials as photoanodes were first designed,and the effect of cathodic protection was studied.Three different triboelectric nanogenerators,PDMS-Al,PDMS/CS-Al and PDMS/CSr-Al,were designed through topology modification and construction of micro-nano structures based on PDMS.Furthermore,a PDMS/CSr-Al triboelectric nanogenerator with superior electrical output performance was selected to assemble a cathodic protection system under the driving of simulated external mechanical forces,and evaluated its cathodic protection performance and application potential.The specific content and conclusions of this dissertation are as follows:（1）First,an anodizing method was used to prepare an ordered array of TiO₂nanotubes with high specific surface area and a unique hollow structure with one-dimensional orientation on a titanium substrate.Then,a three-dimensional morphology of Ni3S2 nanosheet-supported TiO₂ nanotubes was formed on the hollow structured TiO₂ nanotubes by means of hydrothermal method.By analyzing the topography,light absorbing,semiconductor optoelectronic properties and cathodic protection effect,it was found that Ni3S2/TiO₂ can improve its light absorption performance,promote the rapid transfer of photo-generated electrons,increase the yield of photo-generated electrons,and enhance the overall the electrical conductivity and the Fermi energy of TiO₂,which promotes the transfer of more effective photo-generated electrons to 304stainless steel to form cathodic polarization protection.（2）A Ni₂P/TiO₂ type II heterojunction in which rod-shaped nanoparticles and nanotubes are combined on the TiO₂ nanotubes is constructed by hydrothermal method.Similarly,by analyzing its topography,light absorption,semiconductor optoelectronic properties,and cathodic protection effects,it was found that the combination of rod-shaped nanoparticles Ni₂P and TiO₂ nanotubes has structural and performance advantages,which can also improve their light absorption performance and promote photo-generated electrons quickly transfer and increase the yield of photo-generated electrons.This shows excellent optoelectronic properties and therefore also shows good photocathodic protection effects.（3）Based on the concept of blue energy,it fully combines the triboelectric nanogenerator and cathodic protection technology,and strives to develop and utilize new energy and expand new corrosion protection technologies.Based on PDMS,PDMS-Al,PDMS/CS-Al and PDMS/CSr-Al three types of vertical separation triboelectric nanogenerators are constructed.The hollow micro-nano structure exhibits excellent electrical output performance.It is found that under the action of 5 Hz analog mechanical force,the peak value of open circuit voltage can reach up to 77.1 V,and the peak value of short circuit current can reach 33.9 m V/m².The triboelectric nanogenerator can drive 450 commercial LEDs to work normally.The triboelectric nanogenerator cathodic protection system was established under the condition of simulating mechanical external force.It was found that the protection system can reduce the surface potential of 304ss and form cathodic cathodic polarization protection,which presents excellent application potential.