Composition and Process Conditions of Degreasing Solution for Electric Heating Tube Electroplating

Composition and Process Conditions of Degreasing Solution for Electric Heating Tube Electroplating

technological process

Degreasing (degreasing) → Removing old coatings → Two passes of cleaning → Alkali corrosion → Two passes of cleaning → Ash and scale removal (polishing) → Two passes of cleaning → One pass of zinc precipitation → Two passes of cleaning → Zinc layer removal → Two passes of cleaning → Second pass of zinc precipitation → Sulfuric acid neutralization and activation → Cleaning → Chemical nickel plating → Two passes of cleaning → Activation → Pickle plating → Two passes of cleaning → Passivation → Two passes of cleaning → Blow drying → Aging → Inspection personnel warehouse.

2. Main Process Description

2.1 Composition and process conditions of degreasing solution

Sodium hydroxide 40-609/L, 70-90 "c, 1-Zmin.

For those with severe oil pollution, organic solvents should be used for cleaning first.

2.2 Removal of old coatings

Removing the old coating is one of the key processes in aluminum alloy tin plating.

2.2.1 Composition and operating conditions of the solution for removing old layers

Leave 10-150 liters of nitric acid at room temperature until all is returned.

2.2.2 Composition and operating conditions of the solution for removing the old zinc layer

Leave 10 to 150 liters of sulfuric acid at room temperature until fully depleted.

2.2.3 Removal of old oxide film solution composition and operating conditions: Sodium hydroxide 40-609/L, 50-90 "C, until completely removed.

2.24 Composition and Process Conditions of Ni P Alloy Solution for Removal

700mL/L concentrated nitric acid, 30-409/L sodium chloride, 6-109/L hexamethylenetetramine, 15-ZoglL urea, room temperature.

(1) Before stripping, the parts should be dried or blown dry with cold air to prevent the reduction of nitric acid concentration due to moisture, which may cause corrosion of the substrate.

(2) The parts that have been removed from plating should be cleaned quickly to avoid the formation of a black oxide film on the surface after removal.

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