The Study Of Metal Surfaces Application

Corrosion of steel was facing a very serious issue now, and the current researches weremainly focused on film-formed on the steel surface. This study was mainly in the "four inone" phosphating, chemical adsorption film in steel surface and black film formation in steel.This article was divided into the following four parts:Chapter1was mainly summaried the situation of phosphate coating method on steelsurface. A total of76articles were referenced.Chapter2was studied the "four in one" phosphating on normal temperature on the basisof existing studies. This article maked a lot of researches to the test, such as change theaccelerator, add the zirconium potassium fluoride and sodium molybdate to the solution, anduse the novel phytic acid as the buffering agent. Through single factors experimentaldetermined the best formulation and process conditions to the “four in one” phosphatingwhich was oil removal, rust removal, phosphating and passivation on the steel surface at sametime. After the the phosphating process phosphate coating on the steel surface was uniformgrey crystals, the film was uniformly dense, neat and tidy, and the film had good corrosionresistance. This would meet the requirements on the steel component anticorrosion of process,and initially solved contradiction between oil removal, rust removal and phosphate.Chapter3was selected the polyethylene glycol(400), triethanolamine, silane couplingagent, and glycerin as the the main body raw materials, and used the one step way to systemresearch the chemical adsorption film-formed technology on the metal surface. Through thepreliminary experiments and the single factors experiments we optimized the optimumtechnological conditions. The SEM, EDS and reflection infrared were characterized to thechemical adsorption film on the optimum conditions. Trial results showed that the process andprocedures was simply, the tank liquor wa stable, and the surface was formed a densechemical adsorption film which was combined between the pellicle and metal. The resistanceof adsorption film and the corrosion of coating adhesion were superior to the traditionalphosphating process. The structure accumulation of chemical adsorption film was close, stable, and had good corrosion-proof on the metal, which markedly enhanced the adhesionbetween the metal and coating.Chapter4was carried on a black film processing laboratory study of liquid withantimony salt as the main component in order to develop a process of treatment on steelsurface at room temperature. Through single factor experiments and orthogonal testexperiments we optimized the the best blackening treatment process, namely: antimonytrichloride was1.8g/L, aluminum sulfate was0.8g/L, hydrochloride was80.0mL/L, sodiummetasilicate was2.0g/L, sodium molybdatewas1.2g/L, tartrate was7.0g/L, and the reactiontime was9min. Then the film was analyzed the by SEM, EDS, XRD methods. The resultsshowed that the film was a single black mass of antimony-based, and contains a small amountof Al2O3·2SiO2·3H2O crystal composite coating. It showed the crystalline structure in thescanning electron microscope, then preliminary analysis the mechanism on this based.