(1) Degreasing: All parts that need to be blackened must be degreased on the surface otherwise they will not become black or Piebald. After degreasing, wash the parts with hot water and rinse them with running water.
(2) Washing with water: Rinse with tap water for 0.5-1 minute, then rinse with running tap water.
(3) Derusting: Lightly rusted machined parts can be pickled with rust remover agent for 1-5 minutes,
(4) Water washing: first rinse with tap water and then rinse with running tap water for 0.5-1 minute.
Blackening process:
Immediately immerse the parts without grease and rust spots in the blackened working fluid after cleaning, lift the gap up and down 2-3 times, and take it out after immersing for 3-5 minutes using tap water Rinse and rinse.
Post-processing steps: Choose one of three different processing methods:
1 (1) Dehydration oil sealing: immerse the parts that have been blackened, rinsed and rinsed with water in dehydration antirust oil for 3-5 minutes, and lift it up and down 3-5 times.
(2) Hot dipping oil: immersed in boiling aqueous solution for 1-3 minutes, and then hot dipping motor oil or various antirust oils can improve the corrosion resistance (the effect of dipping dehydrated antirust oil is better)
(3) Impregnating sealant: high-end parts (such as photographic equipment, optical instruments) need high wear resistance and good gloss. After dehydrating with boiling water, impregnating the sealant. (Such as acrylic paint, polyurethane paint, etc.)
Solution maintenance:
When the efficiency of the blackening agent decreases, the blue-green color of the solution gradually fades, the pH value rises to about 3.0, and white precipitation occurs, indicating that the blackening agent is aging. At this time, you can filter and clarify, separate the precipitate, and then add a blackening agent stock solution (measured with a precision test paper with pH 0.5-5) until the pH returns to the range of 2-2.8 and you can continue to use. It is best to use two tanks, one tank to work and one tank to clear the sediment.
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