Page 666 - Corrosion Engineering Principles and Practice

620 C h a p t e r 1 4 P r o t e c t i v e C o a t i n g s 621

No particular preparation is required. For outdoor spraying a NIOSH
approved oil mist mask, as worn when spraying indoors, is
recommended. Gloves are worn for comfort, as the aerosol cans or air
powered spray guns quickly get cold. After treatment, any excess
fluid may be wiped up with a cloth or paper towel.
A particular CPC package has been developed for very demanding
applications where pack rust is threatening the integrity of structural
components. The overbased crystalline calcium sulfonate (MOCCS)
coating system made component consists of a penetrant/sealer
designed to penetrate into pack rusted joints and connections
displacing moisture, neutralizing acid, and sealing the joints. The
MOCCS penetrant sealer stripe coat can be applied on large structure
using an airless gun followed by brush touch-ups or simply by using
a brush for smaller areas (Fig. 14.9).

14.6.3 Volatile Corrosion Inhibitors
Volatile corrosion inhibitors (VCIs), also called vapor phase inhibitors
(VPIs), inhibit corrosion by being transported as a vapor from a
permeable container to the site susceptible to corrosion. In boilers,

(a)
FIGURE 14.9 Brush application of a penetrant/sealer designed to stabilize
pack rusted joints: (a) pack rust joint before and during application (b).
(Courtesy of Termarust Technologies)