Chemical immersion plating solution and method for tinning the surface of high-silicon aluminum alloy
A high-silicon aluminum alloy, chemical immersion plating technology, applied in liquid chemical plating, metal material coating process, coating, etc., can solve problems such as dull color and rough surface of tin plating
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Embodiment 1
[0033] This embodiment is a piston (high-silicon aluminum alloy material, ZL108, full name ZAlSn2Cu2Mg1) in a motorcycle engine, which contains 11% to 13% of silicon, 1% to 2% of copper, 0.45% to 1% of magnesium, and 0.45% to 1% of magnesium. Manganese 0.3% ~ 0.9%, aluminum is the balance) the surface is coated with a metal tin layer, the purpose of which is to lubricate during the running-in period of the piston to prevent the cylinder from being strained.
[0034] The formula of the chemical immersion plating solution except water is as follows:
[0035] components Na 2 SnO 3 ·3H 2 o
CH 3 COONa
Acetic acid (based on 60% acetic acid aqueous solution) content 100g / L 70g / L 2ml / L
[0036] The immersion plating process is as follows:
[0037] Place the piston in the above chemical immersion plating solution for immersion plating, wherein the immersion plating temperature is 65°C, the immersion plating time is 5min, and the flow rate of c...
Embodiment 2
[0039] This embodiment is a piston (high-silicon aluminum alloy material, ZL108, full name ZAlSn2Cu2Mg1) in a motorcycle engine, which contains 11% to 13% of silicon, 1% to 2% of copper, 0.45% to 1% of magnesium, and 0.45% to 1% of magnesium. Manganese 0.3% ~ 0.9%, aluminum is the balance) the surface is coated with a metal tin layer, the purpose of which is to lubricate during the running-in period of the piston to prevent the cylinder from being strained.
[0040] The formula of the chemical immersion plating solution except water is as follows:
[0041] components Na 2 SnO 3 ·3H 2 o
CH 3 COONa
Acetic acid (based on 60% acetic acid aqueous solution) content 170g / L 30g / L 12ml / L
[0042] The immersion plating process is as follows:
[0043] Place the piston in the above chemical immersion plating solution for immersion plating, wherein the immersion plating temperature is 70°C, the immersion plating time is 1min, and the flow rate of ...
Embodiment 3
[0046] This embodiment is a piston (high-silicon aluminum alloy material, ZL108, full name ZAlSn2Cu2Mg1) in a motorcycle engine, which contains 11% to 13% of silicon, 1% to 2% of copper, 0.45% to 1% of magnesium, and 0.45% to 1% of magnesium. Manganese 0.3% ~ 0.9%, aluminum is the balance) the surface is coated with a metal tin layer, the purpose of which is to lubricate during the running-in period of the piston to prevent the cylinder from being strained.
[0047] The formula of the chemical immersion plating solution except water is as follows:
[0048] components Na 2 SnO 3 ·3H 2 o
CH 3 COONa
Acetic acid (based on 60% acetic acid aqueous solution) content 120g / L 60g / L 10ml / L
[0049] The immersion plating process is as follows:
[0050] After degreasing the piston surface with gasoline, wash it with water for 15 seconds; etch the piston surface with a mixture of nitric acid with a density of 1.42g / ml and hydrofluoric acid with a d...
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