Alkali Wash Molybdenum Strips

From the physical and chemical properties, ordinary molybdenum strips have various advantages of metal molybdenum, such as bright and glossy surface, high melting point, high specific gravity, high strength, high hardness, low coefficient of thermal expansion, high-temperature resistance, good electrical and thermal conductivity, etc. Note: The natural color of molybdenum strips is silver and black when the surface retains lubricant and oxidized coating.

From the production method, the preparation process of Alkali washing molybdenum strip is molybdenum concentrate → oxidative roasting→ baking sand → leaching → ammonium molybdate solution → purification → neutralization crystallization → polyammonium molybdate → dissolution → ammonium molybdate solution → evaporation crystallization → ammonium paramolybdate → calcination → molybdenum trioxide → reduction → molybdenum powder → molding sintering → molybdenum strip. Note that ammonia water needs to be added when leaching and dissolving; Hydrochloric acid needs to be added when neutralizing crystallization; The gas used in the reduction is hydrogen.

From the appearance and shape, molybdenum strips have rectangular and cylindrical ones; From the surface state point of view, molybdenum strips have alkali washing, polishing, car polishing, and polishing; Alkali washing molybdenum strip refers to ordinary molybdenum rod put into a pot filled with lye for alkali cooking and descaling, with a smooth surface and a gray metallic luster. The lye is formulated with sodium hydroxide and sodium carbonate or trisodium phosphate. A polished molybdenum strip refers to the ordinary molybdenum rod after rough grinding, medium grinding, and fine grinding of the product, the surface is silver-gray metallic luster, and smooth, and the size error is small. Turning light molybdenum strip refers to the ordinary molybdenum rod after the car light processing of the product, although the surface is flat and has a metallic luster, but rough, not as smooth as the alkali washing and polished molybdenum rod. A polished molybdenum strip refers to the ordinary molybdenum rod using mechanical, chemical, or electrochemical ways to reduce the surface roughness of the product, the surface is bright and smooth.

Alkali washing is also commonly referred to as alkali erosion washing or alkali erosion. The process of alkali washing is to put the aluminum material into a strongly alkaline solution with sodium hydroxide as the main component for the erosion reaction, the purpose of the process treatment is: to further remove the surface of the dirt, completely remove the natural oxide film on the aluminum surface, to reveal a pure metal matrix, for the subsequent anodic oxidation uniform conductivity, the formation of a uniform anodic oxide film to lay a good foundation surface. If the alkali washing time is appropriately extended, the aluminum surface can also be flat and uniform, eliminating the slight rough marks on the aluminum surface, such as mold marks, bumps, scratches, etc.; A longer period of alkali washing results in a uniform, soft diffuse reflective surface (i.e. sand surface) without strong reflection. However, excessive alkali washing is a waste of molybdenum resources, which will also cause the molybdenum material to deviate in size, and may reveal the original internal tissue defects (such as coarse crystal, segregation, etc.).

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