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— clogging of cracks by penetrants,
— failure to detect microcracks, underlying or clogged cracks.
3. CORROSION TREATMENT (Tables 201, 202, 203 and 204)
A. Reconditioning principles
Reconditioning after corrosion attack is usually accomplished in five phases :
— cleaning,
— removal of old protection,
— corrosion elimination and neutralization,
— surface treatment,
finishing.
The different phases are given in the form of tables that gather reconditioning principles in accordance with the materials corroded.
Whatever process is retained, it must be borne in mind that full removal of corrosion products must be
achieved. Incomplete removal of corrosion products results in reoccurence of corrosion even after reconditioning.
In cases where small fasteners (screws, nuts, pins, washers, spacers, etc...) are corroded, replacement is
preferable to any reconditioning attempt. Whenever possible, the replacement of small fasteners is preferable since it is more cost—effective and safer.
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B. Anticorrosive products
WARNING : SOME PRODUCTS MAY BE HARMFUL TO USERS. READ MANUFACTURER'S SAFETY INSTRUCTIONS CAREFULLY.
ABRASIVES METALS TO BE TREATED
Carbon and
low alloy steel Stainless steel Aluminum
alloys Magnesium
alloys Copper alloys
Emery paper or
cloth (silicon
carbide) Recommended Acceptable Acceptable Acceptable Acceptable
Corrundum
paper or cloth Acceptable Recommended Recommended Acceptable Recommended
Steel wool Acceptable Prohibited Prohibited Prohibited Prohibited
Aluminum wool Prohibited Prohibited Acceptable Prohibited Prohibited
Stainless steel
wool Acceptable Recommended Prohibited Prohibited Acceptable
Carbon steel
brush Recommended Prohibited Prohibited Prohibited Prohibited
Stainless steel
brush Acceptable Recommended Prohibited Prohibited Acceptable
Metal treatment and protection
Table 201
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PHASES CORROSION
MINOR MAJOR COMMENTS
1. Cleaning — thoroughly clean the surface corroded with a nonmetallic hard-bristle brush and cleaning agent (TB 11-002),
— remove all dust and oxide residues resulting from cleaning, — wash with soft water and dry with compressed air. NOTE 1
2. Removal of old
protection — apply pickling product, — flush
— dry. — mechanical action and appli¬cation of (TB 12-900),
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