A treatment method for brass products before electroplating nickel

Abstract

The invention relates to a processing method of a brass product before electroplating nickel. The processing method comprises the steps: taking 15-20 kg of the brass product, adding into a grinding machine, adding 4-6 L of a grinding fluid and 15-25 L of water into the grinding machine, under a condition of room temperature, grinding for 30-60 min at the speed of 50-60 rpm, washing with water, pickling, activating, and completing. The novel machinery and chemical combination method is adopted to preprocess the brass product, and the appearance and the quality of electroplated nickel of the brass product are improved.

Description

technical field

[0001] The invention relates to a treatment method for brass products before electroplating nickel, belonging to the field of metal surface treatment. Background technique

[0002] At present, most of the pre-treatments on the market are chemical potions (sulfuric acid and nitric acid) that directly chemically corrode copper products, which can easily damage the surface copper and make it electroplated with a different color on the nickel surface. Contents of the invention

[0003] The technical problem to be solved by the present invention is to provide a treatment method for brass products before electroplating nickel. The present invention uses a new mechanical combination chemical method to pretreat brass products to improve the appearance and quality of brass products electroplated with nickel.

[0004] The method of the present invention uses part of acid (sulfuric acid, which is mixed with a large amount of water to reduce acidity), does not react wi...

Examples

Embodiment 1

[0017] Take 16kg of brass products, 4.5L of grinding liquid and 20L of water and put them into the grinding machine. The grinding liquid is composed of cold dehydration and 50% sulfuric acid in a volume ratio of 2:1, and the cold desorption is composed of xylene and scouring agent NP-9, 1 kg The ratio of xylene is 0.1L refining agent NP-9, at room temperature, grind at 50 rpm for 60min, wash the brass product with water after grinding, add 40L of 30% sulfuric acid to the flavonoid product at room temperature, wash for 4~ 6s, at room temperature, add 40L of 3% sulfuric acid to the brass product, soak for 2min, and the product is ready.

Embodiment 2

[0019] Take 20kg of brass products, 6L of grinding liquid and 25L of water and put them into the grinding machine. The grinding liquid is composed of cold dehydration and 50% sulfuric acid in a volume ratio of 2:1, and the cold desorption is composed of xylene and scouring agent NP-9. Toluene ratio 0.1L refining agent NP-9, at room temperature, grind at 50 rpm for 50min, wash the brass product with water after grinding, add 50L of 30% sulfuric acid to the brass product at room temperature, wash for 4~ 6s, at room temperature, add 50L of 1% sulfuric acid to the brass product, soak for 3 minutes, and the product is ready.

technical field

[0001] The invention relates to a treatment method for brass products before electroplating nickel, belonging to the field of metal surface treatment. Background technique

[0002] At present, most of the pre-treatments on the market are chemical potions (sulfuric acid and nitric acid) that directly chemically corrode copper products, which can easily damage the surface copper and make it electroplated with a different color on the nickel surface. Contents of the invention

[0003] The technical problem to be solved by the present invention is to provide a treatment method for brass products before electroplating nickel. The present invention uses a new mechanical combination chemical method to pretreat brass products to improve the appearance and quality of brass products electroplated with nickel.

[0004] The method of the present invention uses part of acid (sulfuric acid, which is mixed with a large amount of water to reduce acidity), does not react wi...

Examples

Embodiment 1

[0017] Take 16kg of brass products, 4.5L of grinding liquid and 20L of water and put them into the grinding machine. The grinding liquid is composed of cold dehydration and 50% sulfuric acid in a volume ratio of 2:1, and the cold desorption is composed of xylene and scouring agent NP-9, 1 kg The ratio of xylene is 0.1L refining agent NP-9, at room temperature, grind at 50 rpm for 60min, wash the brass product with water after grinding, add 40L of 30% sulfuric acid to the flavonoid product at room temperature, wash for 4~ 6s, at room temperature, add 40L of 3% sulfuric acid to the brass product, soak for 2min, and the product is ready.

Embodiment 2

[0019] Take 20kg of brass products, 6L of grinding liquid and 25L of water and put them into the grinding machine. The grinding liquid is composed of cold dehydration and 50% sulfuric acid in a volume ratio of 2:1, and the cold desorption is composed of xylene and scouring agent NP-9. Toluene ratio 0.1L refining agent NP-9, at room temperature, grind at 50 rpm for 50min, wash the brass product with water after grinding, add 50L of 30% sulfuric acid to the brass product at room temperature, wash for 4~ 6s, at room temperature, add 50L of 1% sulfuric acid to the brass product, soak for 3 minutes, and the product is ready.