A, sintered ndfeb rust phosphating process with baskets to oil removal, the cold water wash 1 - pickling of light - the cold water to wash 2 - surface adjustment - 3 to rustproof phosphating, post-processing, cold water washing, sintered ndfeb phosphate preparation process and points for attention,
Magnet installed plastic basket basket can adopt different levels or format (
Purpose is to leave gaps between the phosphating of parts.
Magnet oil HH922B neutral oil removal: 5%;
Liquid temperature: 60 ~ 90 ℃ (
Ultrasound equipment without heating)
Time: to clean the surface oil pollution is advisable.
Magnet cold water wash: 1 time shall not be less than 1 minute,
Depending on the parts surface water film even continuous shall prevail)
Operation mode: the basket (
Must move up and down in the sink, strengthen the cleaning effect,
Magnet pickling light acid liquid concentration: 3% HNO3;
Time: with colour and lustre is uniform surface gloss advisable;
The light trough requirements: to acid (
Magnet cold water washing 2 washing method: flowing water rinse time: not less than 1 minute,
Be sure to clean the residual acid)
Operation mode: pickling out light basket to move to wash in cold water sink after 2 hours, faster, in order to avoid corrosion parts.
Magnet surface adjustment oxalic acid: 25 g/L;
Temperature: room temperature time: 1 minute (
Magnet cold water washing 3 washing method: two counter-current rinse (
Magnet rustproof phosphating phosphating: rustproof phosphating liquid concentration HH951 special rustproof phosphating liquid: water = 1: (
7 ~ 9)
Rustproof phosphating liquid capacity: 15 ~ 20 m2 / kg phosphating liquid maintenance: use regularly adjust to keep its concentration (
Sintered ndfeb magnet post-processing 1.
Don't wash after rust phosphating process, the natural drying or hot air blow dry,
Rustproof one year)
To long-term rust products, after rust phosphating, dry again dipped HH932 dehydrate rust-proof oil, and dry or drying.
Finally, see the oil on the surface, but there is a layer of anti-rust film.
Leaching rust-proof oil dehydration, can drain off water tank should be used.