Inorganic zinc coatings

Dimetcote. [Ameron Protective Coatings] Inorganic zinc coatings. 

Silbond . [Akzo] Silicates intermediate for bindm for inorganic zinc coatings, investment casting molds, cores, ce-ramk shapes, coatings. 

DSS Duplex stainless steel lOZ Inorganic zinc coating... 

Guide for the Repair of Imperfections in Galvanized or Inorganic Zinc Coated Steel Using Organic Zinc-Rich Coating... 

Epoxy high buiid/finish coat 55 75-150 3 h 10 h Two components, topcoat on primed steei and concrete for atmospheric conditions, seais inorganic zinc coatings... 

Where protection is reqnired against atmospheric corrosion only (e.g. nnder rural conditions), it may not be necessary to use sealer, provided an adequate fihn thickness of sacrificial metal contained, for example, in a metalhc or inorganic zinc coating, is applied. Otherwise an apphcation of sealer is a necessity, observing that it is in the interests of the proprietor of a utihty to avoid repetition of expensive overall preparation of surface. Sealer extends the effectiveness of anti-corrosive composition and the anti-corrosive composition prevents the onset of corrosion that penetrates through damaged and porons sealer. Both are complementary to each other. 

Bare inorganic zinc coatings should not be used together with the cathodic protection systems in submerged conditions (sea or brackish water). This applies also to painting of bilges protected with sacrificial anodes. 

Unless otherwise specified, the vendor shall commercially sand blast, in accordance with SSPC SP 6, all grout contact surfaces of the baseplate, and coat those surfaces with inorganic zinc silicate in preparation for epoxy grouting. 

In order to obtain maximum corrosion protection for painted metal articles, the metal parts are pretreated with an inorganic conversion coating prior to the painting operation. These zinc or iron phosphate coatings greatly increase both paint adhesion and corrosion protection. Traditionally, a chromic acid post-treatment has been applied to these phosphatized metal surfaces to further enhance corrosion protection. 

Sacrificial coatings consist of (i) organic zinc-rich primers (ii) inorganic zinc-rich primers. Corrosion control mechanism by zinc-rich primers may be visualized to occur as shown in Figure 1.65. 

Some of the paint types belonging to classes such as alkyds, coaltar epoxies, epoxy, heat-resistant, inorganic zinc types, polyurethanes, water-borne coatings as described by Sigma coatings are given in Table 1.29. 

Heat-resisting aluminum 28 35 30 m 8 h Two-coat system or overcoat for inorganic zinc primer, good up to 360°C... 

Moisture-cured inorganic silicate 50 25 60 m 5 h Finish coat over inorganic zinc primer, good from —90°C to 600°C... 

Inorganic zinc primers did not perform well under insulation, even if they were top-coated. 

Dizinc orthosilicate EINECS 237-057-8 Silicic acid (H4Si04), zinc salt (1 2) Tomusil Willemite Zinc silicate. A proprietary two-pack moisture cured inorganic zinc silicate primer. Insoluble in H2O. Coatings Sigma. 

Inorganic zinc silicate polymer, chemically curing epoxy or polyurethane intermediate coat, and aliphatic polyurethane top coat. 

As indicated in Table 10.18, a zinc-rich primer is often recommended. It can be an organic zinc-epoxy or an inorganic zinc-ethyl-silicate primer. Zinc-rich primers are also used as so-called shop primers, or prefabrication primers, for temporary protection of semi-manufactured steel goods. After fabrication, e.g. of welded steel structures, the shop primer surface must be cleaned (degreased), and possible shop primer defects and weld joints have to be blast cleaned and coated with a primer before the whole structure is painted. Iron oxide is also used as a pigment in some shop primers. These must not be overpainted with a zinc-rich paint. 

Table 5.2 Corrosion Data for Zinc and Zinc Coatings with Inorganic Chemicals... 

Organic (epoxy) zinc-rich primers are used in place or to repair imperfections of the inorganic zinc-rich primer. Their advantages over inorganic zincs include improved adhesion to the epoxy primer coating and better tolerance to poor surface cleaning. 

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