Steel sheet with stanniferous coating and preparation method thereof
A technology for tin coating and steel plate is applied in the field of tin-containing coating steel plate and its preparation, which can solve the problems of high labor input cost and long process flow, and achieve the effect of reducing labor and material cost, good corrosion resistance and solving corrosion resistance.
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[0024] The preparation method of the above-mentioned tin-coated steel plate comprises the following steps:
[0025] 1) The high-quality low-carbon cold-rolled thin steel plate with a thickness of 0.16-0.55mm is degreased, derusted and cleaned, and activated with an acid solution with a weight percentage of 20-25%;
[0026] 2) Wash the activated steel plate with water and then electroplate tin-zinc alloy. The composition of the plating solution is: stannous fluoroborate [Sn(BF 4 ) 2 ]: 35~45g / L, zincous fluoroborate [Zn(BF 4 ) 2 ]: 95~105g / L, polyethylene glycol: 1.5~2.5g / L; pH value: 1.5~2.5; the anode material for electroplating is a tin-zinc alloy sheet containing 75~85% tin.
[0027] 3) Clean the tin-zinc alloy-plated steel plate with water, then reflow the steel plate at 300-400°C with a resistance reflow furnace, then perform quenching, soda cleaning, and chromate cathodic passivation. The passivation solution composition is : Sodium dichromate 20~25g / L, sulfuric acid...
Embodiment 1
[0030] The sample is made of high-quality low-carbon cold-rolled thin steel plate, the sample size (thickness × width × length): 0.16 × 80 × 80mm, the preparation steps are as follows;
[0031] 1) The steel plate is first degreased, derusted, and cleaned;
[0032] 2) Activate the steel plate with 20% hydrochloric acid by weight;
[0033] 3) Wash the activated steel plate with water and send it to the electroplating tank for electroplating tin-zinc alloy. The composition of the plating solution is: stannous fluoroborate [Sn(BF 4 ) 2 ]: 35g / L, zincous fluoroborate [Zn(BF 4 ) 2 ]: 105g / L, polyethylene glycol: 1.5 g / L; pH value: 1.5~2.5; electroplating temperature: room temperature; cathode current density: 12A / dm 2 . The amount of tin-zinc alloy in the resulting coating is 0.8g / m 2 .
[0034] 4) Clean the tin-zinc alloy-plated steel plate with water, and then use a resistance reflow furnace to reflow the steel plate at 300-400°C (flux composition: zinc chloride 44%, ammoni...
Embodiment 2
[0036] The sample is made of high-quality low-carbon cold-rolled thin steel plate. The sample size (thickness×width×length): 0.24×80×80mm. The preparation steps are as follows;
[0037] 1) The steel plate is first degreased, derusted, and cleaned;
[0038] 2) the steel plate is activated with 22% sulfuric acid by weight percentage;
[0039] 3) Wash the activated steel plate with water and send it to the electroplating tank for electroplating a tin-zinc alloy containing 75-85% tin. The composition of the plating solution is: stannous fluoroborate [Sn(BF 4 ) 2 ]: 40g / L, zincous fluoroborate [Zn(BF 4 ) 2 ]: 100g / L, polyethylene glycol: 2.0 g / L; pH value: 1.5~2.5; electroplating temperature: room temperature; cathode current density: 16A / dm 2 . The amount of tin-zinc alloy in the resulting coating is 5g / m 2 .
[0040] 4) Clean the steel plate after plating the tin-zinc alloy coating containing 75-85% tin with water, and then use a resistance reflow furnace to reflow the ste...
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