Research In Synthesis And Checking Methods Of The Novel Hot-dipping Zinc Alloy Applied In Navigation

With the increasing demand of the steel, the corrision problem is of importance all over the world. In the world the eroded mental products accounts of one third of the gross mentel products every year. So, it is a serious project to resolve the corrosion problems. Dealing with the steel's surface by hot-dipping zinc or hot-dipping zinc alloy is most widely used. Herein we report our progress in this important field based on previous works as follows:1. investigated the manufacture of intermediate alloy and the effecting factors. According to the phase change of Zn-Al , Zn-Ni , Zn-RE alloy .We studied the optical melting temperature, time and operation process considering of decreasing energy and increasing yield and obtained satisfactory results.2. The thickness of the hot-galvanized film is a important indication. First studied the relations between the melting time, melting temperature and the thickness of the hot-galvanized film, then according to the metal cooperating effect a series of Zn-Al-Ni, Zn-Al-RE, Zn-Al-Ni-RE hot-galvanized alloy film was produced, Comprehensively considering vanish, the roughness, the thickness, the adhesion and the anticorrosion of the hot-galvanized film, a satisfactory hot-galvanized alloy film suitable of industry application.3. A simple economical and rapid spectrophotometric method for the determination of trace Al, Ni, RE in alloy has been developed. Utilizing o-CDAA instead of classical DMG determines Ni(~0.01% Ni)in he hot-galvanized alloy film. In the borax buffer solution(pH=10) nickel with a new chromogenic reagent o-CDAA forms brick red stable complex which shows maximum absorption at 542nm with a molar absorption 1.40 × 10~5.Beer's law is obeyed in the range of 0-6μg/25ml for nickel with a repeatability(RSD) of 1.0% at a concentration of 5μg/25ml .This proposed method is very sensitive , simple and rapid. On the other hand, the spectrophotometric methods of DBK-5FA, DBM-FasA, DBF-FasA, TC-FasA are used separatively to determinetrace RE in the hot-galvanized alloy film Except the method by of TC-FasA, all of the others are good for determining RE with high slectivity(The permitted amount of Zn i ions>10000times), high sentivity( e =1.20X 105 Lmor'crrf'without surfactant), wide range to obey Beer's law and high stability.