Chemical passivation process method for copper and copper alloy thin-walled part

Abstract

The invention discloses a chemical passivation process method for copper and a copper alloy thin-walled part. The method comprises the following steps of (1) acceptance check; (2) oil removing of an organic solvent or oil removing of a water-based washing agent; (3) installing and hanging; (4) oil removing; (5) hot water washing; (6) flow cold water washing; (7) water film continuity check; (8) alkaline washing; (9) flow cold water washing; (10) light corrosion; (11) flow cold water washing; (12) weak corrosion; (13) flow cold water washing; (14) chemical passivation; (15) flow cold water washing; (16) hot water washing; (17) drying; and (18) inspecting. The chemical passivation process method has the beneficial effects of being suitable for the chemical passivation process method for thecopper and the copper alloy thin-walled part which exist black oxide skins on the surfaces after heat treatment softening treatment, obviously improving the chemical passivation effect of the copper and the copper alloy thin-walled part, and being suitable for the chemical passivation treatment of other copper and copper alloy parts.

Description

technical field [0001] The invention relates to a chemical passivation process method, in particular to a chemical passivation process method for copper and copper alloy thin-walled parts. Background technique [0002] After heat treatment, annealing and softening, the surface of copper and copper alloy thin-walled parts will produce black scale. In the prior art, because the process has requirements on the hardness of the parts, if the oxide skin on the surface of copper and copper alloy thin-walled parts is removed by sand blowing, etc., the parts will be deformed; because it is a thin-walled part, it cannot be processed. Electropolishing treatment; so most of the existing degreasing and cleaning methods are used to remove the oxide skin on the surface of copper and copper alloy thin-walled parts. Because when oil or other foreign pollutants remain on the surface of the parts, after high-temperature heat treatment, the pollutants will react with oxygen in the air and sint...

AI Technical Summary

Problems solved by technology

In the prior art, because the process has requirements on the hardness of the parts, if the oxide skin on the surface of copper and copper alloy thin-walled parts is removed by sand blowing, etc., the parts will be deformed; because it is a thin-walled part, it cannot be processed. Electropolishing treatment; so most of the existing degreasing and cleaning methods are used to remove the oxide skin on the surface of copper and copper alloy thin-walled parts. Because when oil or other foreign pollutants remain on the surface of the parts, after high-temperature heat treatment, the pollutants will react with oxygen in the air and sinter on the surface of the parts, which is oxide scale, which is no longer simple oil or dirt. Foreign pollutants adhered to the surface of the part, so ordinary water washing or alkaline degreasing cleaning cannot remove them

After the parts are passivated, there is still black oxide skin remaining on the surface

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