A collection of information on fire-retardant coatings for steel structures!

As long as the finished steel drum can leave the factory smoothly, its performance must be tested

1: Flash rust on the weld

Flash rust on welds has occurred more and more in recent years

The easiest way is to apply directly without adding water after opening the barrel

It should be noted that the occurrence of flash rust in the weld but no flash rust in other places cannot be used as a basis for judging the poor performance of the coating

2: Sagging

In general, the thinner the paint, the easier it is to sag

After the water-based paint is opened, do not add water for construction.

It should be noted that the poor sag resistance of the coating does not mean that the performance of the coating is not good.

3: Foaming

The blistering problem is more complicated

Today I will also tell you how to adjust the paint if the water resistance is not good, from the perspective of the formulation

4: Return to rust after being exposed to rain

The analysis of the cause of the re-rust problem is also more complicated.

However, there are three reasons for rust reversion.
One is insufficient film thickness, the other is poor film formation, and the third is not dry
.

Insufficient film thickness is divided into two aspects, one is the thickness of its own construction is too thin, and the other is defects such as cracks, pinholes, and dark bubbles
.
If the film thickness is not enough, increase the number of construction passes
.
If there are defects such as cracks, pinholes, etc.
, the on-site treatment method is to add more water to make the drying slower, so as to improve the problems such as cracks and pinholes
.

The main manifestation of poor film formation is cracks or micro-cracks.
In fact, the coating temperature is too high to form a good film at room temperature
.
It can be solved by heating and drying
.
If there is no heating equipment, then the film-forming auxiliary can only be added later
.