Metal surface sandblasting

One of the commonest corrosion protection ways in pipelines , metal structures and ships hulls is the lining treatment with the colors, resins and isolations .

Having a fine surface clean and free of corrosion and encrustation is essential for the lining process .

Grinding and polishing and brushing are the methods in use for smaller sized surface cleaning but if large, this is done through the commercial ways sandblasting .

Sandblasting s chiefly done for achieving two aims:

To clean and remove the external incrustations and corrosions and to meet the metal surface.

To appropriate coarseness on the metal surface for better adhesion of the protection lining.

Sandblast is accomplished in diverse degrees according to different needs.

Figure below indicates for popular degrees in sandblast treatment and also their standard figures in America and Sweden .

 

Cleaning degree

Sweden standard

American standard

Surface cleaning quality

Plain white Sp-3 Sp-5

100%

Milky white Sp-2 1/2 Sp-10 95%
Economical Sp-2 Sp-6 75%
Rust cleaning Sp-1 Sp-7 50%

 

Different aggregates such as Silica sand, Iron grit, Aluminum oxide powder and etc are used in sandblasting that each represents its own specific level regarding the color and fineness degree.

The larger the grading size and aggregates mesh the coarser will be the created ���.. , it also depends on some other elements such as : consuming air pressure or collision angle of aggregates.