In order to find out useful fluxes for aluminizing, cleaning action of fluxes for oxide films on steel surface, solubility of Al
2O
3 as flux, and the fluxing effect in the boundary of steel and molten aluminum in case of dipping, were examined using chloride, fluoride, boride, carbonate, etc.
As a result, it may be concluded that the flux for aluminizing should satisfy the following conditions:
1. The steel surface should be wet.
2. The Al
2O
3 film should be removed by dissolving.
3. Flux should free from the aluminum-steel boundary.
4. No gas film forming in the aluminum-steel boundary is allowed.
5. No degrading aluminum purity is allowed.
The flux of the eutectic composition of KF-AlF
3 system (54.2% AlF
3) is most excellent, and next comes the flux of NaF-AlF
3 system.
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