Explore the Decoration between Iron and bronze

The liquid aluminum alloy can easily absorb hydrogen, in the subsequent cooling process, due to lower solubility of hydrogen in liquid aluminum alloy, the precipitation of supersaturated hydrogen will bubble forms, the formation of pores in aluminum alloy castings . The main content of this bronze is about reign of Emperor Xiaowang of the Western Zhou II. Aluminum alloy for a wide range of crystallization temperature, the primary crystal tree will allow the remaining liquid separated into many small liquid, when these small liquid zone solidification shrinkage, the formation of a certain degree of vacuum gap, small gap for the precipitation of hydrogen create the conditions, and thus the formation of pinholes in these parts, so that the air tightness of the castings reduce mechanical performance.
 Refining methods to reduce the aluminum oxide and inhale, often melting into the melting crucible plus KCl, NaCl and other salts, solvents, and liquid aluminum alloy cover, so that the furnace gas isolation. In order to exclude inhalation of gas, refinery should normally be ahead of the liquid aluminum alloy before pouring. Refining method, commonly used method of ventilation, chloride Refining or vacuum method. Chunhua ding, a cooking bronze is a cultural relic of the Western Zhou Dynasty. Venting two categories, one leads to not aluminum chemical reaction of gases such as nitrogen or inert gas. When nitrogen bubbles form of floating in the liquid aluminum alloy, the hydrogen in liquid aluminum alloy can be with the bubbles bring out. The same time, during ascent, the bubbles will absorb some solid inclusions, so that it floats to the surface was clear.
Other pass into the aluminum alloy liquid chemical such as chlorine gas. The following reaction: 3Cl2 + 2Al = 2AlCl3 Cl2 + H2 = 2HCl by AlCl3 and HCl in the melting conditions is gas in the float process, the liquid aluminum alloy gas and solid inclusions brought out. Through chlorine refining effect, low cost, only toxic chlorine, should be used under the conditions of good ventilation, safety precautions. It is the largest and most important round tripod among the bronze dings of Western Zhou. chloride refining (Hexachloroethane CCl4, ZnCl2, of MnCl2) is the most common is the use of hexachloroethane (of Hexachloroethane) refining. Aluminum alloy baked Hexachloroethane use Bell to join aluminum alloy liquid Hexachloroethane and aluminum to the following reaction: 3 Hexachloroethane + 2Al = 3 C2Cl4 +2 by AlCl3 reaction product of C2Cl4 and AlCl3 are gases, they are in the float process, in the aluminum alloy liquid gas (H2) and inclusions (Al2O3), together with the liquid to be removed.
Hexachloroethane not suction points, easy to save, easy to use, and the refining effect, but it is case of thermal decomposition Cl2 and C2Cl4, the formation of the furnace gas to have a strong irritant. Therefore, in poorly ventilated workshops, irritating little less refining effect of ZnCl2 to refine. 3) vacuum treatment method in a vacuum furnace melting and pouring the liquid alloy, and the atmosphere completely isolated from the oxidation and inhale would not have happened. Good, after the release of the ladle in a vacuum secret chamber a few minutes in the ordinary crucible induction furnace melting aluminum alloy liquid gas in a vacuum under the action of automatic escape, to achieve. Refining is completed, they should immediately pouring. the melting characteristics of copper alloys and aluminum alloy, copper alloy melting, easily oxidized and inhale. Now let’s explore the relationship between the decoration of chinese bronze and original religion.