A stainless steel fluoropolymer synergistic coating treatment process

Abstract

The invention discloses a stainless steel and fluoropolymer synergistic coating treatment process. The process comprises the following steps: firstly, removing an oxide film on the surface of a stainless steel material, and performing nickel pre-plating on the oxide film to prepare a nickel pre-plated layer; then, performing electroless nickel plating on the nickel pre-plated layer to prepare an electroless nickel plated layer; next, etching the electroless nickel plated layer with an etching solution which is a mixed solution containing sulfuric acid, phosphoric acid, an emulsifier OP-10, sodium dodecyl benzene sulfonate, sodium succinate and glycine, and introducing fluoropolymer on the microporous surface once or repeatedly after etching; finally, performing heat treatment under vacuumto fuse the fluoropolymer and the electroless nickel plated layer integrally to form the synergistic coating. The prepared stainless steel synergistic coating has extremely high bonding strength and hardness and good corrosion resistance and self-lubricating performance, and also has low-temperature non-stick performance, even if the stainless steel synergistic coating is placed in an environmentat subzero 40 DEG C, the coating still has good non-stick performance, and the coating can not only be used for storing food in a cold storage room, but also can be used for storing non-PVC plasma bags in the medical field.

Description

technical field [0001] The invention relates to stainless steel coating treatment, in particular to a stainless steel fluoropolymer cooperative coating treatment process. Background technique [0002] Stainless steel materials have good plasticity, toughness, wear resistance, good processing performance, and are resistant to corrosion by weak corrosive media such as air, steam, and water. They are widely used in chemical, food machinery, electromechanical, and environmental protection industries. However, when stainless steel materials are in direct contact with seawater, soil or carbon steel, the corrosion rate is very fast, even exceeding that of ordinary low-carbon steel, which cannot meet its more and more extensive use requirements; for example, stainless steel products used in marine environments need to have High corrosion resistance, stainless steel precision transmission parts used for mechanical transmission require ultra-high hardness and excellent self-lubricatin...

AI Technical Summary

Problems solved by technology

Different from general steel materials, stainless steel materials are hard-to-plate and difficult-to-treat materials due to surface inertness, and the surface adhesion is very poor. Conventional surface treatment methods cannot greatly improve the properties of stainless steel materials such as hardness, strength and corrosion resistance, and the prepared coating The bonding force with stainless steel surface is poor; in the study of improving metal coating performance and surface treatment, researchers have successfully obtained the desired material performance characteristics by combining the advantages of two or more materials and processes, such as the metal anode The oxide film is combined with a low-friction polymer or lubricant to control infiltration, which is modified by precision heat treatment, and finally a precision coating (also called a synergy coating) that is an integral part of the metal part is obtained. The coating has high hardness, strength, corrosion resistance and self-lubricating properties. Its comprehensive performance exceeds that of composite coatings in the general sense, and it has great application value. At present, the coatings of aluminum alloy materials and steel materials have been disclosed. Fluoropolymer synergistic coating treatment process, wherein CN1616713A discloses the specific steps of the fluoropolymer synergistic coating treatment process for iron and steel materials: the iron and steel materials are first subjected to alkaline chemical degreasing, electrolytic degreasing or pickling activation treatment according to conventional methods , and then use rack plating or barrel plating to chemically plate nickel-phosphorus alloy in acidic electroless nickel plating to obtain a nickel base layer, then use a hole-enlarging solution to carry out chemical hole expansion treatment or electrochemical AC hole expansion treatment on the nickel base layer, and then The iron and steel material after the hole expansion treatment is placed in a fluoropolymer emulsion (a mixture composed of one or more fluoropolymers such as polytetrafluoroethylene, tetrafluoroethylene, and hexafluoropropylene) for hot dipping or electrolysis, or using The spraying method sprays the fluoropolymer emulsion on the surface of the nickel base layer after the hole expansion treatment to obtain the nickel-based coating containing fluoropolymer; finally, the nickel-based coating is placed in a vacuum heat treatment furnace for heat treatment to obtain the steel fluoropolymer cooperative coating. Floor

The inventor tried to use the fluoropolymer synergistic coating treatment process disclosed in CN1616713A to prepare a stainless steel synergistic coating, and found that the prepared synergistic coating had very poor bonding strength with the stainless steel surface, and could not even form a synergistic coating

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