How to remove rust and prevent corrosion from new tanks
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There are currently two new storage tanks, each with a capacity of 100 m3 and made of carbon steel. Due to being left unused for a long time, a layer of surface rust has formed on their interior surfaces. How can the interiors of these tanks be rust-removed and protected against corrosion? ?
Is it convenient for sandblasting? After sandblasting to remove rust, apply anti-rust paint. If people need to work inside, proper protective measures must be taken; the \"eight requirements for entering containers\" set by the Ministry of Chemicals must be followed, and supervision is necessary before working begins.
Grind or sandblast with a angle grinder to achieve the Sa2-1/2 standard, then apply anti-rust paint or corrosion-resistant coating; see GB8923 for specific requirements.
First, remove rust using dilute acid, sandpaper, or a angle grinder; this step must be done properly, otherwise the anti-corrosion paint applied later will peel off easily. Then sweep or wipe away the rust powder on the surface. Then apply red rust-proof paint as a primer. Finally, apply the anti-corrosion paint.
Sandblasting is used for rust removal; once the requirements of standard GB8923-88 \"Grade of Rust and Degree of Rust Removal on Steel Surfaces Prior to Painting\" are met, the appropriate coating for corrosion protection is determined based on the medium stored in the tank, as well as whether it is installed underground or above ground.
The simplest method: use an electric sanding disc to remove rust to St 3 level, then apply 2 coats of epoxy antistatic primer and 2 coats of epoxy antistatic topcoat. Of course, the result will be better if sandblasting is possible, but it’s more costly and not easy to carry out.
How to check whether the paint thickness meets the standard?
There are many types of electronic coating thickness gauges, and they are very easy to use; the testing specifications depend on the thickness you require
To achieve good quality, sandblasting is necessary; generally, using a power tool for rust removal is sufficient, and after removing the rust, applying a coat of anti-corrosion paint will do