Matters needing attention in the treatment process of high-strength blackened bolts

Matters needing attention in the process of processing high-strength blackened bolts:

It is strictly forbidden to bring in acid or alkali substances, which will damage the film-forming function of the blackening agent. The application temperature should be maintained at 40-50 ℃, and it must be mixed frequently when not in use to maintain the condition of the blackening agent in good condition. Attention should be paid to the use of post-cleaning liquids, as far as possible to prevent the use of inorganic salt-based cleaning agents, because inorganic salts have the function of reducing after the water film is dry, so the salts in the cleaning liquid will be brought into the blackening agent, and the quantitative change will occur. To the sudden change, the function of the application will be damaged after all.

After the blackening agent is used for a period of time, usually half a year, the blackening agent must be exchanged throughout the tank.

Questions about the quality of high-strength blackened bolts during blackening can be handled in the following ways:

1. Black out again from the tempering furnace;

2. Adjust the concentration of blackening agent;

3. Cleaning fluid after replacement.

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