Deplating method for deplating brass surface tin-nickel coating
A technology of tin-nickel plating and brass, applied in the field of electroplating, can solve the problems of strong product corrosion, heavy responsibility, physical injury of operators, etc., and achieve the effect of simple operation steps and low cost
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example 1
[0019] First, put 200g egg white in a container, add deionized water to it, the mass ratio of egg white and deionized water is 3:1, stir well, add papain with 10% egg white mass to it, and adjust the temperature to 50°C , and using a sodium hydroxide solution with a mass concentration of 5% to adjust the pH to 7.5, stir for 2 hours, and let stand for 20 minutes to obtain amino acids for subsequent use; get 200g of fat and place it in a container, add lipase to it, and the amount added is the same as that of the fat The mass ratio is 1:2, stir well, mix evenly, let stand for 15min, get fatty acid, set aside; put 250g sucrose in a container, add deionized water until deionized water submerges sucrose, after soaking for 30min, add starch Enzyme, the mass ratio of the added amount to sucrose is 1:2, and keep warm in a 45°C water bath for 3h, then add amylase, the added amount to the mass ratio of sucrose is 1:4, continue to keep warm for 1.5h, naturally Cooling to obtain hexose; i...
example 2
[0021] First, take 100g egg white and place it in a container, add deionized water to it, the mass ratio of egg white and deionized water is 3:1, stir well, add papain with 5% egg white mass to it, and adjust the temperature to 35°C , and using a sodium hydroxide solution with a mass concentration of 5% to adjust the pH to 7, stir for 1 hour, and let stand for 15 minutes to obtain amino acids for subsequent use; get 150 g of fat and place it in a container, add lipase to it, and the amount added is the same as that of the fat The mass ratio is 1:2, stir well, mix evenly, let stand for 10min, get fatty acid, and set aside; put 200g sucrose in a container, add deionized water until deionized water submerges sucrose, after soaking for 25min, add starch Enzyme, the mass ratio of the added amount to sucrose is 1:2, and keep warm in a water bath at 40°C for 2 hours, then add amylase, the added amount to the mass ratio of sucrose is 1:4, continue to keep warm for 1 hour, and cool natu...
example 3
[0023] First take 150g of egg white and place it in a container, add deionized water to it, the mass ratio of egg white and deionized water is 3:1, stir well, add papain with 7% egg white mass to it, and adjust the temperature to 40°C , and using a sodium hydroxide solution with a mass concentration of 5% to adjust the pH to 7, stir for 1 hour, and let stand for 17 minutes to obtain amino acids for subsequent use; get 170 g of fat and place it in a container, add lipase to it, and the amount added is the same as that of the fat The mass ratio is 1:2, stir well, mix evenly, let stand for 12min, get fatty acid, set aside; put 220g sucrose in a container, add deionized water until deionized water submerges sucrose, after soaking for 27min, add starch Enzyme, the mass ratio of the added amount to sucrose is 1:2, and keep warm in a water bath at 42°C for 2 hours, then add amylase, the added amount to the mass ratio of sucrose is 1:4, continue to keep warm for 1 hour, and cool natura...
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