Metal expansion joint inner surface ETFE (ethylene tetra fluoro ethylene) electrostatic powder spraying process

Abstract

The invention discloses a metal expansion joint inner surface ETFE (ethylene tetra fluoro ethylene) electrostatic powder spraying process. The metal expansion joint inner surface ETFE electrostatic powder spraying process includes following steps: S100, inspecting materials: inspecting if the inner surface of a metal expansion joint has cracked and sunken defects, and performing a next step of theprocess after the inner surface of the metal expansion joint passes inspection; S200, performing cleaning and drying: removing blots and rusty spots from the inner surface of the metal expansion joint, and drying the metal expansion joint after finishing acid-base neutralization and washing; S300, performing sand blasting and phosphating: performing the sand blasting on the inner surface of the metal expansion joint so as to roughen the inner surface of the metal expansion joint, performing the phosphating on a rough layer, and forming a uniform and compact spraying combined layer; S400, performing electrostatic spraying: adopting a single time and multiple channel spraying mode for spraying ETFE solid power to the inner surface of the metal expansion joint and solidifying the ETFE solidpower, and forming an anti-corrosion coating. The metal expansion joint inner surface ETFE electrostatic powder spraying process is reasonable in design, greatly improves adhesive force between the electrostatic powder spraying coating and a component to be processes, prevents the electrostatic powder spraying coating from falling off, and improves electrostatic powder spraying quality.

Description

technical field [0001] The invention relates to the technical field of electrostatic powder spraying, in particular to an ETFE electrostatic powder spraying process on the inner surface of a metal expansion joint. Background technique [0002] The working principle of the electrostatic powder spraying method is almost the same as that of the general liquid paint electrostatic spraying method, the difference is that the powder spraying is dispersed rather than atomized. It is a paint sprayed by an electrostatic powder spray gun. While dispersing, the powder particles are negatively charged. The charged powder particles are subjected to the action of airflow (or other forces such as centrifugal force) and electrostatic attraction, and are applied to the grounded surface. On the object, it is heated to melt and solidify to form a film. Electrostatic powder spraying method is the dominant powder coating method in the field of industrial coating. [0003] In the electrostatic p...

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Problems solved by technology

[0004] However, in the products produced by the existing electrostatic spraying process, due to the low adhesion between the sprayed coating and the surface of the processed object, after long-term use, the electrostatic sprayed coating is easy to fall off from the surface of the processed part, affecting the corrosion resistance of the processed part. There are certain defects

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