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Corrosion Prevention Flashcards

(63 cards)

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1
Q

AR 750-1 Army Materiel Maintenance Policy

A

• Establishes the Army Corrosion Prevention and Control Program

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2
Q

AR 750-59 Army Corrosion Prevention and Control Program

A
  • For each system and equipment item, TMs and TBs will contain corrosion inspection requirements and techniques for preventing and controlling corrosion that are approved by the Army Corrosion Prevention and Control Program Manager
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3
Q

Public Law 107-314 Sec: 1067 (Bob Stump) Prevention and mitigation of corrosion of military infrastructure and equipment requires that:

A

• Deparment of Defense (DoD) must designate a responsible official or organization for the prevention and mitigation of corrosion
• DoD develop a long-term corrosion strategy

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4
Q

(AMCOM)

A

Aviation and Missile Life Cycle Management Command

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5
Q

Corrosion inspection and Removal

A

Personnel Required.
Two

Tools and Equipment Required.
Glass, Magnifying, 10x
Mirror, Inspection
Cloth, Abrasive P-C-1673 Medium Cloth, Abrasive P-C-1673 Fine Cloth, Lint Free (Texmpe Tx309)
Water Displacing Corrosion Preventive Compound (MIL-PRF-81309 TYPE I)
Water Displacing Corrosion Preventive Compound (MIL-PRF-81309 TYPE I)
Water Displacing Corrosion Preventive Compound (MIL-DTL-85054)
Alcohol, Isopropyl
Wash Bottle
Mixing container
Gloves, Rubber Depressor, Tongue Brush, Cleaning
Brush, Acid (H-B-643)

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6
Q

CORROSION IS

A

THE ELECTROCHEMICAL DETERIORATION OF A METAL THAT ALLOWS IT TO RETURN TO ITS NATURAL STATE

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7
Q

Corrosion returns the metal

A

to an ore state and releases that energy in the form of electricity

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8
Q

battery is an

A

enclosed/controlled corrosion cell that releases electrical energy and corrodes the internal metal

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9
Q

FOUR COMPONENTS OF CORROSION

A

CONDUCTIVE PATH

CATHODE

ANODE

ELECTROLYTE

REMOVE ONE AND CORROSION HALTS

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10
Q

What is the most common electrolyte with aerospace equipment corrosion

A

Water

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11
Q

What containments increase the strength of the electrolyte

A

Salt (salt water)
Atmospheric pollution (acid rain)
Dirt
Soda

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12
Q

The rate of corrosion varies with

A

The electrolyte concentration

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13
Q

What containments breakdown protective coatings

A

Petroleum,oils, lubricants POLs are NOT electrolytes

Allows electrolytes to reach metal surfaces

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14
Q

Electrolyte examples

A

Blood
Urine
Soda
Coffee

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15
Q

Fuels and oils are

A

NoT electrolytes

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16
Q

Fuels and oils soften protective finishes which will allow containments to

A

Reach the metal surface

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17
Q

Types of corrosion

A

Uniform surface
Pitting
Galvanic
Inter-granular/exfoliation
Crevice
Filiform
Stress
Fretting

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18
Q

Equipment should be cleaned to

A

-Prevent corrosion-removes salt, electrolytes
-Allow thorough inspection
-Reduce fire hazards-accumulation of leaks
-keep equipment clean-best step for no corrosion

OE considerations must be reviewed

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19
Q

Before cleaning you should

A

-analyze area being cleaned
-type of soil being cleaned or removed
-identify appropriate cleaning agents or materials
-identify cleaning procedures per TM

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20
Q

Purpose of inspection

A

-Early detection, identification, and treatment reduce costs resulting from corrosion
* Without regular systematic inspections, corrosion will seriously damage equipment
* Frequent corrosion inspections are essential to the overall corrosion control program

  • Personnel performing any scheduled inspections shall be trained in corrosion detection
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21
Q

In accordance with the TM, the minimum frequency for corrosion inspections are

A

monthly

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22
Q

• For painted surface, if there is visual evident of corrosion present,

A

attempt to dislodge the paint by masking tape or by scraping with a sharp plastic tool

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23
Q
  • If repairable, remove corrosion using:
A

• Abrasive Mats
• Aluminum Oxide Sandpaper
• Bristle Disks

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24
Q

Wire brush use:

A

• Same metal wire brushes only
• Aluminum on Aluminum
• Steel on Steel

Do NOT use steel wire brushes on Aluminum or Magnesium

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25
VISUAL EVIDENCE OF CORROSION
Paint blisters, or bubbles, or other coating irregularities
26
VISUAL EVIDENCE OF CORROSION aluminum
corrosion products will be white, gray, or black and may appear as a paste when wet or a hard, adherent film or crumbly deposits when dry
27
VISUAL EVIDENCE OF CORROSION steel
corrosion products are red, brown, or black rust deposits
28
VISUAL EVIDENCE OF CORROSION copper
corrosion products are blue or blue-green and are also easily detected
29
How many stages of degrees of corrosion
5 stages
30
DEGREES OF CORROSION stage 0
No visible corrosion, paini discoloration (not caused by corrosion) is permissible.
31
DEGREES OF CORROSION stage 1
Surface corrosion, red rust or paint blistering present
32
DEGREES OF CORROSION stage 2
Beginning of base metal loss, characterized by moderate corrosion products, blistering may be present.
33
DEGREES OF CORROSION stage 3
Significant base metal loss, pin holes may be present.
34
DEGREES OF CORROSION stage 4
Stage 4 - Perforation of base metal, no metal remains at location of severest corrosion, loss of structural integrity.
35
How do you fix a degree stage 1/2 corrosion
Normally removed by light hand sanding
36
How do you fix a degree stage 2/3 corrosion
This type of damage is normally removed by extensive hand sanding or light mechanical sanding
37
How do you fix a degree stage 4 corrosion
The damage must be removed by extensive mechanical sanding or grinding
38
Corrosion prone areas
-Fasteners -Faying surfaces and crevices -spot welded assemblies -exhaust impingement areas -hinges -water entrapment areas -battery compartments -electrical connectors -electrical cables -bare metal -flat areas -access panels areas -tool boxes and storage areas -outrigger -outrigger piston -outrigger limit switch -outrigger control box
39
Corrosion preventive compounds CPCs are used to
To protect metal parts and components
40
Types of application of CPCs corrosion preventative compounds
Brushing Dipping Spraying
41
CPCs corrosion preventative compounds are separated into two major categories
Water displacing Nonwater displacing
42
Water displacing
Used to remove electrolytes from metal surfaces
43
Non-water displacing
Used on dried surfaces or on surfaces which have been first treated with water displacing CPCs
44
When should preservatives be used
Preservatives should be used after equipment cleaning, before and after deployment, and when an extended period of equipment storage is anticipated
45
Because of their temporary nature, CPCs must be
regularly removed and replaced to provide continuing corrosion protection
46
CORROSION PREVENTATIVE COMPOUNDS (CPCs) MIL-PRF-81309E, Type II does what
- Displaces water (electrolyte) - Soft film - Shall be used to protect areas which cannot be properly drained and difficult to reach
47
CORROSION PREVENTATIVE COMPOUNDS (CPCs) MIL-PRF-81309E, Type II is used on
- Hinges, sliding/moving parts * Caution: attracts sand/dirt which can bind some components - Damaged/missing paint (MIL-DTL-85054 preferred)
48
CORROSION PREVENTATIVE COMPOUNDS (CPCs) MIL-PRF-81309, Type III does what?
- Only Electrical grade CPC - Displaces water (electrolyte) — Leaves an ultra-thin film - Permits electrical connection
49
CORROSION PREVENTATIVE COMPOUNDS (CPCs) MIL-PRF-81309, Type III used on
- Internal parts of electrical connectors - Grounding strap components — Electrical bonding areas
50
CORROSION PREVENTATIVE COMPOUNDS (CPCs) treated
Treated with MIL-C-81309 Type Ill on inside and MIL-C-85054 on the outside prior to being subjected to corrosive elements for months * Change in resistance after 6 months
51
CORROSION PREVENTATIVE COMPOUNDS (CPCs) untreated connected wires to connected ports
* Most likely resulted in a failed connection which is preventable
52
Primary purpose of painting
The primary purpose of any paint system is to protect exposed surfaces against corrosion and other forms of deterioration.
53
When do you paint
Touch-up painting is done to prevent corrosion, not for purely cosmetic reasons Scratches, chips, or marring of the paint surface observed during maintenance will be repaired at the field level to prevent corrosion damage
54
What do you paint with?
Chemical Agent Resistant Coating (CARC)
55
(CARC)
Chemical Agent Resistant Coating
56
Chemical Agent Resistant Coating (CARC) is the
approved coating for all combat and combat support equipment, tactical vehicles, aircraft, and essential ground support equipment and reparable containers
57
Paint primers are used to
Bond metals, provide corrosion resistance and a surface to which the CARC topcoat will firmly adhere
58
- The dry film thickness should be between ____________for aluminum and between ____________for aluminum-steel assemblies
0.6 and 0.9 mils 0.8 and 1.2 mils
59
The CARC topcoat provides
-chemical agent resistance - color for the system -camouflage protection to visible and near infrared means of detection
60
TWO authorized exterior CARC topcoats
MIL-DTL-53039 and MIL-DTL-64159
61
MIL-DTL-64159 is the
only water dispersible CARC and is the preferred topcoat for touch-ups
62
CARC kit
• 1 ea bottle of WD paint • 1 ea bottle of catalyst • 1 ea bottle of de-ionized water • Optional * 1 ea Roller * 1 ea Brush
63
(COTS) PAINT
COMMERCIAL-OFF-THE-SHELF Aerosol paint

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