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Ever-Power Machinery Manufacturing Co., Ltd.The surface treatment of the coupling is divided into two types: basic black boiling and acid black boiling. Next, let me introduce you the ratio and advantages and disadvantages of the two methods.
The proportions and advantages and disadvantages of base boiled black:
Sodium hydroxide 650g
250 grams of sodium nitrite
1 liter of water
Temperature 135-145 degrees (boiling)
Time: 10-30 minutes.
Advantages: cheap, easy to material, with the increase of the ratio of concentration (within the range of) and reaction time, the oxide film gradually thickens.
Disadvantages: mechanical strength-performance and adhesion are relatively weak, and it is relatively difficult to apply to alloy materials.
The formula and advantages and disadvantages of acid-based boiling black:
Barium nitrate 40-50 grams
Phosphoric acid 3-5 grams
One liter of water
Temperature 98-100 degrees
Time: 30 minutes
Advantages: mechanical strength-performance and adhesion are relatively better, and it can also be applied to alloy reflection.With the increase of the proportioning concentration (within the range of) and the reaction time, the oxide film gradually thickens.
Disadvantages: The material price is relatively high.Barium has a relatively large impact on the human body and the environment.
Special note: Clean the dirt on the coupling surface before the two methods.After oxidation, rinse and dry with clean water in time.
Supplementary treatment-saponification film and oily film.
皂化膜 发黑清洗干燥结束后，用2-3%的肥皂水（20-30克固体肥皂/1升水），在80-90度煮5-10分钟。
After the oily film is saponified, rinse it with clean water. After drying, soak it in 100-120 degree oil for 5-10 minutes.