How are fluxes generally classified in terms of corrosiveness?

Fluxes are classified in various categories based on their corrosiveness, which is crucial for selecting the appropriate flux for a specific application. The correct classification includes intermediate, non-corrosive, and highly corrosive fluxes.

Non-corrosive fluxes are designed to protect the base metals during the soldering or brazing process without causing damage, making them suitable for sensitive materials or when post-processing cleanup is challenging. Intermediate fluxes may offer some level of protection but can still cause corrosion over extended periods or under certain conditions. Highly corrosive fluxes tend to accelerate the deterioration of metals and should be used with caution, typically followed by thorough cleaning processes to remove residual flux.

These classifications help technicians and engineers to choose the right flux type according to the materials involved in their work and the desired longevity of the joint. Overall, understanding the corrosiveness levels of fluxes is essential for ensuring the integrity and durability of soldered or brazed connections.