Red copper member natural color passivation process
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A process, the technology of red copper, which is applied in the field of passivation process of red copper parts, can solve the problems of non-corrosion resistance and corrosion resistance that cannot meet the passivation requirements of red copper parts, and achieve the effect of improving corrosion resistance
Inactive Publication Date: 2016-11-30
ANHUI DONGFENG MACHINERY & ELECTRONICS TECHNCO
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[0006] On the one hand, the above-mentioned disclosed technical solutions are not suitable for the passivation of the natural color of copper parts, and on the other hand, they are not corrosion-resistant, and the corrosion resistance performance cannot meet the passivation requirements of copper parts. HNO 3 (d=1.42) 50% solution drop method is less than 5 seconds
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Embodiment 1
[0033] A kind of natural color passivation process of red copper parts, this process comprises the steps of following sequence,
[0034] 1) Acid degreasing: Put the copper parts into the hanger, immerse them in solution a, and degrease for 3 seconds at a temperature of 28°C. The solution a is made by mixing 1L sulfuric acid, 1L nitric acid and 1L tap water;
[0035] 2) Washing in cold water: immerse the degreased red copper piece in tap water at room temperature for 2 seconds, and wash away the residual acid in the above steps;
[0036] 3) Polishing: mix the above water-washed red copper parts with solution b, and polish for 3 seconds at a temperature of 30°C to give a mirror luster. The solution b consists of 1L sulfuric acid, 1L nitric acid, and 0.8L of 5g / l Nacl made;
[0037] 4) Flowing cold water washing: at normal temperature, wash the above-mentioned polished red copper piece through running water for 2 seconds to clean the residual acid in the above-mentioned process;...
Embodiment 2
[0049] A kind of natural color passivation process of red copper parts, this process comprises the steps of following order,
[0050] 1) Acid degreasing: put the copper parts into the hanger, immerse them in solution a, and degrease for 10 seconds at a temperature of 25°C. The solution a is mixed with sulfuric acid, nitric acid and tap water with a volume ratio of 1:1:1 production;
[0051] 2) Washing in cold water: immerse the degreased red copper piece in tap water at room temperature for 10 seconds, and wash away the residual acid in the above steps;
[0052] 3) Polishing: mix the above water-washed red copper parts with solution b, and polish at a temperature of 25°C for 10 seconds to produce mirror luster. The solution b is composed of sulfuric acid and nitric acid with a volume ratio of 1:1, and a concentration of 15g / l made of Nacl;
[0053] 4) Flowing cold water washing: at normal temperature, wash the above-mentioned polished red copper parts by running tap water f...
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Abstract
The invention discloses a red copper member natural color passivation process, which comprises: immersing a red copper member into a solution a, and removing oil; at a room temperature, immersing the red copper member into tap water, and carrying out water washing; polishing the red copper member through a solution b; at a room temperature, carrying out flowing water washing on the red copper member through tap water; removing surface floating copper from the red copper member through a solution c; at a room temperature, carrying out flowing water washing on the red copper member through tap water; carrying out acid washing on the red copper member through a solution d; carrying out flowing water washing on the red copper member through tap water; carrying out passivation on the red copper member through a copper member passivation agent; carrying out flowing water washing on the red copper member through tap water; immersing the red copper member into a solution e; carrying out flowing water washing on the red copper member through tap water; carrying out blow drying on the red copper member through compressed air; and drying the obtained red copper member at a temperature of 80-110 DEG C. According to the present invention, the natural color passivation operation is performed on the red copper member through the steps, such that the corrosion resistance is improved, the general protection requirements are met, and the European Union ROHS standard is met.
Description
technical field [0001] The invention relates to a process for treating red copper parts, in particular to a natural color passivation process for red copper parts. Background technique [0002] Copper, also known as red copper, is the simple substance of copper, named for its purple-red color. Various properties see copper. Red copper is industrial pure copper with a melting point of 1083°C, no allotropic transformation, and a relative density of 8.9, which is five times that of magnesium. The mass of the same volume is about 15% heavier than ordinary steel. Because of its rose red color and purple color after the oxide film is formed on the surface, it is generally called red copper. It is copper containing a certain amount of oxygen, so it is also called oxygen-containing copper. [0003] At present, after machining copper and copper alloy workpieces, passivation treatment is required to improve their discoloration resistance and corrosion resistance. The passivation o...
Claims
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