This standard is provided to define the effectiveness of the industrial hard anodize coating on rolled and cast aluminum material for the purpose of wear resistance improvements. The industrial hard anodizing is typically processed with low temperature or various organic acid based baths, and has higher coating hardness is more wear resistant compared to the conventional anodize coatings. The surface pore sealing process is not normally applied unless corrosion protection is required. In such case, the wear resistance tends to decrease.

(1) Types

Hard anodizing types are classified based on the base material as shown on [Table 1].

[Table 1] Hard anodizing types

(2) Coating thickness

The thickness is to be the average thickness as a general rule. The thickness and its uniformity are to be determined by agreements of the related parties.

(3) Coating hardness

The coating microhardness is to be as shown on [Table 2]

(4) Wear resistance

The wear resistance must be tested by either a reciprocating wear test, spray wear test, or flat plate wear test, and must comply to [Table 3], [Table 4], and [Table 5] each.

【表2】皮膜の微小硬さ

Note 1) 1 Wear resistance reference specimen is as follows.
Material: A1050P-H14 or H24, Dimension: 100×100×2mm Flat plate, Sulfate coating: Free sulfuric acid 180±2g/L, AL concentration 1~5g/L, Deionized water adjusted, Electrolysis condition: 0±0.5°C, Current density 3.5±0.35A/dm2, Electrolyte air agitated or recirculated, Coating thickness 50±5μm, Pores unsealed.