The process entails components to be firstly degreased in BF716, followed by etching BF517 , and then immersion in both a surface conditioner BF451 and then blacking solution BF481. Corrosion protection is afforded by a final immersion in dewatering oil BF833. After which the components are left to air dry.
A typical line would be configured as below:
Blackfast 716 light alkaline degreaser
Dilution: 1part solution : 1 part water
Op. Temp: >15ºC
Immerse for 15 – 20 minutes
Water rinse
Immerse for 30 seconds
Blackfast 451 conditioner
Dilution: 1 part solution : 3 parts water
Op. Temp: >20ºC
Immerse for 40-60 seconds
Water rinse
Immerse for 30 seconds
Etching – Blackfast BF517
Dilution: 1 part solution : 9 parts water
Op. Temp: >15ºC
Immerse for 2-3 minutes
Water rinse
Immerse for 30 seconds
Blackfast 451 conditioner
Dilution: 1 part solution : 3 parts water
Op. Temp: >20ºC
Immerse for 30-60 seconds
Water Rinse
Immerse for 30 seconds
Blacking – Blackfast 481
Dilution: 1 part solution : 3 parts water
Op. Temp: >20ºC
Immerse for 30-60 seconds
Water rinse
Immerse for 30 seconds
Dewatering – Blackfast 833
Neat Dewatering
Immerse for 5-10 mins
Air Dry
View complete technical information on how to effectively apply the various relevant solutions for your blacking production line.
Information for the safe handling of both Supplied (Concentrated) and Working (Diluted) Solutions.
In each of the guides on this page, you’ll find testing processes based on proven tests for checking and adjusting the strength of our solutions
Blackfast’s Aluminium blacking process is a simple dip operation specifically designed for use in factories.
A uniformed colouring is obtained over machined surfaces, threads and blind holes. Blacking is achieved by the chemical conversion of the metal surface.
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Blackfast Chemicals Ltd is a company registered in England and Wales. Registered number: 05368415.
Registered office: Unit 5, Russell House, Molesey Road, Walton-On-Thames, Surrey KT12 3PE.