Replacing Floor Plate - Remove Rust Scale?

[treemkr]

Hi. Working on a tank repair where we are replacing all floor plate due to soil side corrosion. Upon removal of old plate there is a layer of rust scale left behind which is quite brittle. Disturbing cause powdering and settling into aggregate foundation material. Question is: Will this rust scale be corrosion initiator to the new plate being installed if the scale is not removed?

 

[chicopee]

Will a magnate work? if it does try using one of these magnate on wheels used to remove nails from job sites.

 

[weldstan]

Yes it could be,

 

[valleytank]

You're replacing an entire floor and didn't anticipate having foundation rework in the process? Possibly some added drainage?

If not, then it's obvious that the remnants of rust scale and possibly contaminated ones aren't a major concern. But.. id take it out. It's a shame to go through that arduous process and get sloppy in the first step.