产品详情
Description and Uses
Alseal 5000 is a single-component, chrome-free coating composition formulated for protecting ferrous alloys from both high
temperature heat oxidation and at the same time offer sacrificial (cathodic) protection to the base metal. Because of its
high temperature capabilities, it offers excellent protection when exposed to cyclic high temperature and corrosive salt
environments, continuing to provide sacrificial properties at temperatures to 1150°F. Although an inorganic coating, it
combines thermal stability, excellent adhesion and hardness, along with good flexibility... a property not found in most
inorganic coatings. As mentioned above it offers salt corrosive protection to 1150°F. At about 1200°F. the aluminum
oxidizes to a point where it no longer provides its excellent sacrificial properties, however, it will continue to offer excellent
heat oxidation continuously to 1600°F. and in some cases, depending on metal substrate, has offered heat oxidation
protection to 2200°F.
Tests have been conducted using low carbon steel alloys. There was no loss of weight after several weeks continuous
exposure at 1000°F. After exposure to 5% salt spray for 1000 hours, there was no evidence of corrosion.
Further, the coating formed from Alseal 5000 composition offers superb thermal shock resistance. The coated metal will not
crack, spall, or fail after shocking from 1100°F. to room temperature repeatedly.
Alseal 5000 coating composition offers greater protective properties in combination of heat, weathering, corrosion, and
oxidation resistance than organic paints and is lighter in weight and more flexible than most ceramic coatings.
Surface Preparation
Special care must be exercised in the preparation of the surface for all high quality, premium performance coatings.
1) Degreasing. All oil, grease and other organic deposits must be removed by suitable degreasing operation or by heating
parts to temperature sufficiently high to facilitate removal.
2) Cleaning and Roughening. All old coats, mill scale, rust, or other tightly adherent deposits must be removed by a
method such as dry grit blasting or vapor blasting. Grit blasting, using clean aluminum oxide (AL2
O3
) grit, is the recommended
cleaning procedure which is necessary for maximum adhesion to steel, although other abrasive methods may be satisfactory.
