Sealing Quality On GlobalSpec

From METALAST International, Inc.

Post sealing treatment is normally specified for the anodic coatings formed on aluminum when corrosion protection is a primary concern. The better the sealing quality, the higher the corrosion resistance. Both anodizing process and sealing process influence the sealing quality. Acid dissolution test (ADT) is a widely accepted standard method for evaluating the sealing quality of anodic coatings. This spec provides a set of comprehensive ADT results on the sealing quality of the anodic coatings produced by the MLT-II process. Four coupons (4"x 4") of each alloy placed on a titanium rack were anodized to 0.7 mil using the MLT-II process at different current densities, then sealed in either nickel acetate solution (190 °F) or boiling DI water (212 °F), in accordance with the operational parameters specified by each sealing process, respectively. The acid dissolution tests were performed according to ASTM B 680-80. The precision of the ADT method is 1 mg/dm2. The results were reported on the average of data from the four coupons of each alloy under an identical condition.

Read the Whole Article

Products & Services

Industrial Coatings

Industrial coatings are thin films deposited upon materials to add or enhance desired properties, such as color, conductivity, corrosion resistance, etc.

Search by Specification | Learn more about Industrial Coatings | Industrial Coatings Insights

Product Announcements

Anodic Coatings for Aluminum and Aluminum Alloys

Aerospace Defense Coatings Of Georgia

This specification covers the requirements for six types and two classes of electrolytically formed anodic coatings on aluminum and aluminum alloys for non-architectural applications... (read more)

Topics of Interest

Coating Weight & Conversion Efficiency

The conversion efficiency of an anodizing process, one of the performance criteria, is defined as the percentage of the weight (WC) of anodic coating produced over the theoretical weight of the...

Depth Profile of Wear Resistance in Hard Anodic Coatings

Depth profile of wear resistance is one of the major characteristics of hard anodic coatings. This TECHSpec provides the depth profiles of the wear resistance in the anodic coatings formed on three...

Surface Smoothness: The Surface Roughness of Anodic Coatings Resulting from the MLT-II and MLT-III Processes are Analyzed

The surface roughness of aluminum alloys anodized using the METALAST process has been measured and the results are summarized in this spec. The surface roughness is reported on the average of the...

Current Efficiency: Current Efficiency Using METALAST Process is Close to 100% in Most Cases, Supporting Resistance to Burning, Higher Quality Performance, and Superior Quality

The current efficiency (h) of an anodizing process, one of the performance criteria, is defined as the percentage of the mass of the alloy consumed over the theoretical consumption of the alloy mass...

Wear/Abrasion Resistance

The wear or abrasion resistance of aluminum anodic coatings is one of the most important characteristics of hard anodized aluminum. Anodized aluminum is used for such components as pistons, cylinders,...