Table of Contents
Advertisement
(c) If color is needed, topcoat with a urethane finish.
12. Corrosion Protection Primer
A.
All pretreatments described are not protective coatings. Therefore, all pretreated surfaces must receive a corrosion
protection primer.
B.
Refer to Tools and Material for materials.
C. Application of Corrosion Resistant or Fuel and Corrosion Resistant Primer
(1) Mix components of the chosen primer as required by the manufacturer.
(2) Apply with high volume low pressure, or electrostatic spray equipment.
NOTE:
(3) Dry film thickness must be 0.0006 to 0.0009 inch.
(4) Primer may be topcoated after air drying for one hour.
13. Corrosion Protection for Dissimilar Metals Contact
A.
Grouping of Metals According to Compatibility.
NOTE:
Dissimilar metals in contact with each other in the presence of moisture and oxygen will cause a
galvanic cell and the most active metal will corrode.
B.
Table 3 lists the metals in groups that are electrochemically similar in nature and are dissimilar to the materials in the other
groups.
Table 3. Similar Groups
Group A
Magnesium and Alloys
NOTE:
Beryllium alloys must be classified on the basis of the major alloying element which, in most cases,
is not beryllium itself.
NOTE:
Carbon steels of the 1000 series (such as 1005, 1010, etc.) and Low Alloy steels of the 4000 series
(such as 4130, 4340, etc.) are compatible only with cobalt and nickel.
Rules For Using Table 3
(1) A material listed in Table 3 refers to the material on the surface of the part.
(a) Zinc includes both zinc metal parts and parts made from another metal which have been plated with zinc.
(b) Chemical and electrochemical surface treatments, such as an anodized finish or conversion coatings on
Copyright © Textron Aviation Inc.
Retain printed data for historical reference only. For future maintenance, use only current data.
Primer may be applied by brushing but is not recommended.
Group B
Aluminum - pure vacuum
deposited
All Aluminum Alloy
Beryllium (Pure) (1)
Cadmium Zinc
FOR TRAINING PURPOSES ONLY
ISSUE 02 , JAN 2018
Model 510 Structural Repair Manual (Rev 2)
Group C
Chrome Plate
Lead
Diffused Cadmium
Stainless Steels: a)
Martensitic (400 series)
Tin, Tungsten and alloys
Print Date: Wed Mar 21 05:10:02 CDT 2018
51-20-01-0 (Original Issue)
Group D
Chrome Plate
Cobalt and alloy (2)
Copper and alloys (includes
Brass and Bronze)
Gold, Graphite
Lead Nickel Plate (2)
Platinum Rhodium and alloys
Silver - see Rule (2)
Stainless Steels: a) Austenitic
(300 Series) (b) (Inconel c)
(Monel d) Precipitation
Hardened Steels (15-5 PH, 17-
4 PH, 17-7 PH)
Tin
Titanium and alloys
Tungsten and alloys
Page 8 of 10
Hide quick links:
Advertisement
Table of Contents
