Standard Test Method for Sandwich Corrosion Test

Importancia y uso:

5.1 The data generated by this test method shall be used to determine whether aircraft structural aluminum alloys are liable to be corroded or damaged by application of the test material during routine maintenance operations.

5.2 Interpretation of the sandwich corrosion test results is based on a comparison of the appearance of faying surfaces of three sets of coupons. One set of test coupons is exposed with reagent water only in the faying surfaces, to establish the baseline (controls) against which the panels exposed to the test material are compared. Disregard corrosion at cut edges of the test coupons.

5.3 The relative corrosion severity rating system is provided in order to allow a numerical classification of the test results and to eliminate the necessity for elaborate weight loss measurements. Pitting corrosion, which is rated 4—extensive (severe) corrosion, may involve only a negligible weight loss.

5.4 Relative corrosion severity rating system:

Appearance/Corrosion:

0—No visible corrosion and no discoloration present

1—Very slight corrosion or very slight discoloration, and/or up to 5 % of area^A corroded

2—Discoloration and/or up to 10 % of area^A corroded

3—Discoloration and/or up to 25 % of area^A corroded

4—Discoloration and/or more than 25 % of area^A corroded, and/or pitting
  present

(A) ”Area” refers to area under the filter paper, or if no filter paper is used, the area where the test material was applied.

Subcomité:

F07.07

Referida por:

C0800-19, D6361_D6361M-98R20

Volúmen:

15.03

Número ICS:

49.025.99 (Other materials)

Palabras clave:

aircraft maintenance chemicals; aluminum structural aircraft alloys; faying surfaces; sandwich corrosion;