mod 2 corrosion

Topics of corrosion

schedule

Navy aircraft must be cleaned at least every 7 days when aboard and 14 days ashore

Daily Cleaning

When deployed within 3 mi of salt water or when flown below 3000 feet over salt water

High Alkaline Cleaners

Compound cleaner that are NOT authorized for Navy aircraft

MILPRF 680 type ll

Most common cleaning solvent

Navair 509

Where to look up recommended dilutions

Immediate cleaning

When areas highly corrosive deposits

40 degrees

Routine scheduling should not be performed at ____ and below

Why should you not rinse with a solid stream of water

Damaging fragile sections/water intrusion

Wash Rack Waste

Equivalent of secondary sewage treatment

Method used to prevent streaking

Working from lower surfaces upward and out

Lubrication

Prevents wear from moving parts, displaces water, fills air spaces and provides barrier against corrosion

Procedures for lubrication

prep( clean with milprf 680) apply, and clean up excess

Two most common lubrication fittings

zerk and flush type

Method of lubrication used for packing the wheel

Hand

Method of lubrication used to cover large areas

Brush

Fasteners

Subject to high operational loads, moisture intrusion. Areas around these are common corrosion prone.

Capillary action

Entry of fluids by this action causes corrosive liquids to flow into tight joints

Visual inspections

The area within 36 inches (18 on each side) of the repair shall be visually inspected

Where can the steps for general inspections for basic corrosion be found

Volume ll chap 3 navair 509

Light corrosion

Scarring or etching and is removed by light hand sanding

Moderate Corrosion

Scaling or flaking and removed by extensive hand sanding or light mechanical sanding

Severe corrosion

Severe intergranular corrosion and is to be removed by extensive mechanical sanding

General Purpose Grease

Specified for aircraft wheel bearings

Uniform corrosion

Most common type of corrosion

First step in cleaning corrosion

Cleaning

What corrosion technique is NOT authorized for navy o level or I level maintenance

Chemical corrosion removal

Who makes sure the aircraft is fire proof/ explosion safe

Gas Free Engineering(GFE), Gas Free Engineering Technician(GFET)

Blow off excess material with not more than ____ air pressure

10 Psi

Should be completely removed from the surfaces because combined with water could corrode

PKP (purple k powder)

What procedure is used to cleanup volcanic ash

NA 509 vol ll chap 9

Prepeg

Basic building block for advanced composites

Two most important factors in preventing corrosion

Removal of electrolytes, application of coating

Electrolytes

Liquid solution containing ions

Most commonly found on aluminum and magnesium alloys

Pitting

Improves the properties of a lubricant

Additives

Corrosion defined

Electrochemical deterioration