A kind of powder zinc-seeding agent, anti-corrosion metal parts and zinc-seeding method
A technology of powder zinc sherardizing and metal parts, which is applied in the field of powder zinc sherardizing agent, anti-corrosion metal parts and zinc sherardizing, which can solve the problems of easy explosion and low safety, so as to prolong the service life, improve the corrosion resistance and reduce the cost. low effect
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Embodiment 1
[0051] This embodiment provides a powder zinc-seeding agent, which includes the following components in parts by mass: 20-100 parts of metal powder, 40-80 parts of dispersant, and 0.2-5 parts of decomposer, wherein the The metal powder includes 60-97 parts of zinc powder and 3-40 parts of magnesium powder.
[0052] On the one hand, the atomic radius of zinc is 0.1332 nanometers, and the atomic half-valence of magnesium is 0.1598 nanometers. The difference between the atomic radii of the two is less than 15%. At the same time, both magnesium and zinc have a close-packed hexagonal structure, so the two can work together to form a seepage layer. Although magnesium itself is not resistant to corrosion, it can occupy some positions of zinc atoms in the crystal structure of zinc, especially at the grain boundaries. A certain amount of magnesium can gather at the weak grain boundaries of zinc and form through high-temperature reactions. MgZn 2 , Mg 2 Zn 11 Zn-Mg alloy phase, MgZn ...
Embodiment 2
[0068] On the basis of Example 1, this embodiment provides a powder zinc sherardizing agent, which also includes 0.5-3 parts of an active agent capable of promoting magnesium infiltration into the infiltration layer, such as 0.5 parts, 1 part, 1.5 parts, 2 copies, 2.5 copies, 3 copies, etc., this application does not limit this.
[0069] Specifically, the active agent is preferably a magnesium halide, and the magnesium halide includes at least one of magnesium chloride, magnesium fluoride, magnesium iodide, and magnesium bromide.
[0070] Since the magnesium halide is always in the solid state during the process of powder zinc sheathing, it can fully contact and react with the surface of the iron and steel parts and the seepage layer, which is helpful to realize the infiltration of magnesium more easily, and then adding magnesium halide as an activator can promote the rapid development of magnesium Effective infiltration into the infiltrated layer can promote the interaction b...
Embodiment 3
[0073] On the basis of embodiment 1 or 2, this embodiment provides a powder zinc sherardizing agent, the powder zinc sherardizing agent also includes manganese dioxide, the mass fraction of manganese dioxide is not greater than the mass fraction of the decomposer, specifically , the mass number of manganese dioxide can be 0-3 parts, such as 0.01 part, 0.05 part, 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 1 part, 1.5 part, 2 parts, 2.5 parts, 3 parts Depending on the specific circumstances, this application does not limit this.
[0074] In practical application, adding manganese dioxide to the powder zinc sheathing agent can be used as a catalyst for the infiltration reaction of magnesium, which promotes the diffusion of magnesium into the infiltration layer by reacting with ammonium halide as a decomposing agent. First, the ammonia halide is decomposed at high temperature to obtain ammonia and hydrogen halide gas, and then the hydrogen halide gas reacts with manganese d...
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Abstract
Description
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Application Information
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