Thermal Diffusion Galvanization Zinc Coating
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Solution Overview
Problem
Current diffusion galvanization methods face challenges in extending the service life of metal articles by reducing corrosion and optimizing zinc consumption while maintaining furnace productivity.
Innovation Solution
A two-component zinc mixture is used, comprising acicular zinc powder and spherical zinc powder encapsulated in a capsule that disintegrates at a specific temperature, applied in a hermetically sealed container with inert gas and activating agents, forming inner and outer zinc layers through controlled heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single zinc powder mixture is used for diffusion galvanization, then the process is simple, but the coating quality and corrosion resistance are insufficient
Solution Approach 1:
The zinc coating is divided into two distinct layers: an inner layer formed from acicular zinc powder (3-5 μm) providing adhesion and corrosion resistance, and an outer layer formed from spherical zinc powder (20-25 μm) providing smooth finish and additional protection. This segmentation of the coating structure resolves the contradiction by achieving superior corrosion resistance through layered architecture while maintaining process simplicity through simultaneous application of both powders in a single diffusion galvanization cycle.
2Reliability
If more zinc is used to ensure complete coverage and protection, then corrosion resistance improves, but zinc consumption increases
Solution Approach 1:
Different zinc powder types are applied to different functional requirements: acicular zinc powder (3-5 μm) is used for the inner layer where adhesion and corrosion barrier properties are critical, while spherical zinc powder (20-25 μm) is used for the outer layer where smooth finish and uniform coverage are important. This local quality differentiation optimizes zinc consumption by assigning each powder type to its most effective position in the coating structure, reducing overall zinc usage while maintaining superior corrosion resistance.
3Productivity
If conventional diffusion galvanization is used, then the process is straightforward, but furnace productivity is limited
Solution Approach 1:
The invention uses a composite zinc powder system combining acicular zinc particles (3-5 μm) and spherical zinc particles (20-25 μm) in a single diffusion galvanization process. This composite approach enables simultaneous formation of a dual-layer coating structure with the inner acicular layer providing adhesion and corrosion resistance, and the outer spherical layer providing uniform coverage and smooth finish. The composite material system resolves the contradiction by achieving both high productivity through single-step application and superior coating uniformity through complementary particle morphology.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enhances the service life of metal articles by reducing corrosion and minimizing zinc usage, while increasing furnace efficiency and productivity.
Implementation Method 1
spherical zinc powder (20-25 μm) which is loaded into a capsule having walls which disintegrate at a temperature of 400±20° C.
Implementation Method 2
heating to a temperature of 350-380° C. to form the inner layer of zinc due to the adhesion of the acicular zinc to the surface of the article to be treated
Implementation Method 3
form the inner layer of zinc due to the adhesion of the acicular zinc to the surface of the article to be treated
Data Source
AI summary
Proposed is a method of applying a zinc coating to metallic articles by thermal diffusion galvanization. Articles to be treated and a two-component zinc mixture are loaded into a hermetically sealed container, the cavity of the container is filled with an inert gas, and heating is carried out. The first component of the mixture, in the form of a powder of acicular zinc having a size of 3-5 μm, is loaded directly into the container, and the second component, in the form of a powder of spherical zinc having a size of 20-25 μm, is loaded into a capsule having walls which disintegrate at a temperature of 400±20° C., which is placed in the container at the same time as the articles to be treated. A flux is loaded into the container, and an inert process gas and an activating agent for intensifying the adhesion process are supplied.