Operative Procedure N° PO 001 DS

1-Scope

The Deltar-Shield finishing has been realized in order to get a topcoat with high corrosion resistance and a very low thickness.

Deltar-Shield is based on specific norms like ASTM, UNI ISO etc., with the support of tests effected every day in our laboratories and in external laboratories that are universally recognized and accepted (see attached certificates).

2-References

- ASTM B 633-98

- ASTM B117-97

- DELTAR DATA SHEET

- Attached certificates

3-Production

This treatment is effected by skilled labour at the Deltar company plant in Cavenago Brianza.

4-Product

Deltar-Shield is a deposit composed of: zinc-plating and/or similar coating applied according to norms ASTM B 633-98; a topcoat having the technical characteristics described in the attached procedure (data sheet).

5-Process cycle

A - Preparation of base metal (according to norm ASTM B633-98)

B - Application of zinc-plating and/or similar coating (according to norm ASTM B 633-98)

C - Application of the Deltar-Shield topcoat

D - Heat treatment at a temperature of 100 °C +/- 15%

6-Process control

The bath is controlled daily and the necessary additions are made on the basis of the treated sq.dm and of the drag out, the latter being directly connected to volume and density.

7-Final controls

Visual control:

The treated parts must be free from pores, cracks and blisters.

Thickness:

It is measured on the complete coating through special instruments (e.g. FISHER PERMASCOPE) or metallographic section.

Adhesion:

Control effected according to norm ASTM B 571-91.

Corrosion resistance:

The test is carried out every three months c/o the Deltar in-house laboratory according to norm ASTM B 117-97.

TECHNICAL SHEET

Research at Deltar has always had as an aim the discovery of materials that have such physical-chemical characteristics as to confer better and better technical qualities on the coated parts, and offer the market reliable and resistant products. During these studies the D-Shield treatment has been set up by the Deltar research center. Through this treatment it has been possible to obtain an important barrier to metal corrosion. D-Shield is applied on zinc-plated materials, iridescent or silver passivated, in order to preserve the zinc deposit from corrosion; this is due to the formation of an organic film englobing submicronic particles of organic polymers, inhibiting corrosion, and polysilicons blocking the corrosive action of aggressive substances.

In all hostile environments and critical conditions Deltar-Shield stands out among all the coating systems for its absolutely innovative performance principle:

Repeated cycles of heat resistance tests at 120 °C for 1 hr do not cause any alteration in the protective properties.
Mechanical stresses, like fretting, scorings, impacts do not provoke early phenomena of white rust.
Corrosion resistance: salt spray test according to ASTM B 117, for a deposit of 12 µ thickness
Absence of white rust after 350 hrs
Absence of red rust after 450 hrs

The above listed evident advantages induce manufacturers to prefer Deltar-Shield to many commonly used treatments, but what is also taken into consideration is the possibility to obtain very high protection results by employing low deposit thicknesses.