TO 1-1-700 - Robins Air Force Base
TO 1-1-700 - Robins Air Force Base
TO 1-1-700 - Robins Air Force Base
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<strong>TO</strong> 1-1-<strong>700</strong><br />
Figure 3-22. Failed Chromium Plating<br />
Table 3-1. Corrosion of Metals - Type of Attack and Appearance of Corrosion Products<br />
Alloys Type of Attack to Which Alloy Is Susceptible Appearance of Corrosion Product<br />
Magnesium Alloy Highly susceptible to pitting White, powdery, snow-like mounds, and<br />
white spots on the surface.<br />
Low Alloy Steel<br />
(4000-8000 series)<br />
Surface oxidation and pitting, surface, and intergranular<br />
Reddish-brown oxide (rust).<br />
Aluminum Alloy Surface pitting, intergranular, exfoliation, and fretting White to gray powder.<br />
Cadmium (used as a<br />
protective plating for<br />
steel)<br />
Stainless Steels<br />
(300-400 series)<br />
Nickel-base Alloy<br />
(Inconel, Monel)<br />
Copper-base Alloy,<br />
Brass, Bronze<br />
Chromium (plate)<br />
Silver and Gold<br />
Uniform surface corrosion; used as sacrificial plating to<br />
protect steel<br />
Crevice/concentration cell corrosion; some pitting in<br />
marine environments; corrosion cracking; intergranular<br />
corrosion (300 series); surface corrosion (400 series)<br />
Generally has excellent corrosion resistance qualities;<br />
susceptible to pitting in sea water<br />
Surface and intergranular corrosion<br />
Pitting (promotes rusting of steel where pits occur in<br />
plate)<br />
Gold - none; Silver - tarnish from sulfides in air; can<br />
cause galvanic corrosion of contacting metals<br />
From white powdery deposit to brown or<br />
black mottling of the surface.<br />
Rough surface; sometimes a red, brown,<br />
or black stain.<br />
Green powdery deposit.<br />
Blue or blue-green powdery deposit<br />
(patina).<br />
No visible corrosion products; blistering<br />
of plating due to rusting of the base metal<br />
and lifting of plating.<br />
Black tarnish deposits on silver surfaces<br />
3-15