Corrosion

 Stress  Corrosion                              Corrosion  Fatique                               Fretting  Corrosion                            Heat  Treatment 

 

 

 

Common Corrosive Agent

 

    Forms  of  Corrosion

  Type  of  Corrosion

Corrosion Control

   Corrosion  Removal

 Preventive Maint. 

 List of Agents  :  Substances that are capable of cousing a corrosive reaction sometimes are called corrosive agents. The most common corrosive agent are acids, alkalies, and salts. The atmosphere and water, the two most common media for these agents, may sometime tend to act as corrosive agents too.read more

Corrosion and Mechanical Factors.   Corrosive attack is often aggravated by mechanical factors that are either within the part or applied to the part, such as residual, static or cyclic stress force, erosion, or foor heat treatment techniques.  Corrosive attack that is aided by some mechanical factor usually causes that part to degenerate at an accelerated if it were subjected solely to corrosive attack. Envoronmental conditions and the composition of the alloy also influence the extent of attack. Example of this kind of alliance are stress-corrosion cracking,corrosion  fatique and fretting corrosion              Read more ....... .

Treatment of Corroded Areas.  There are two basic methods of corrosion removal - machanical and chemical. The method used depends upon the type of structure, its location, the type and severity of corrosion and the availablity of maintenance equipment. Mechanical mean are generally used on moderate to heavy corrosion, particularly if the part involved has a relatively heavy cross section or is skin of heavy gage.  Lighter corrosion is removed by chemical means.  Mechanical methods are recomended for heavily corroded areas on all nonclad alluminum alloys and on magnesium  alloy.  

Light corrosive :  Characterized by discoloration or pitting to a depth of afroximately 0,001 inch maximum.  This type of damage is normally removed by light hand sanding or minimum of chemical treatment.

Moderete corrosion. :     Appears similar to light corrosion except there may  be some blisters or evidence of scaling an flaking. Fitting depths may be as deep as 0,010 inch. This type of damage is normally remove by extensive hand sanding or mechanical sanding.   

Severe corrosion :     General appearance may be similar to maderete corrosion with severe blistering exfoliation and scaling or flaking.

Pitting depths will be deeper than 0,010 inch.  This type of damage is normally removed by extensive mechanical sanding or granding.   Determining degree of corrosion damage, ( light, moderate, or severe ) with a depth dial gage if accessibility permits.  Before measurements are made, visually determine if corrosion is in an area which has previously been reworked.  If  corrosion is in the recess of a faired or blended area, measure damage to include material which has previously been removed. The following method outlines the process for taking measurements with the gepth gage.  Bugs.....read more. 

   

  Common Corrosive.

List of Agents.

Bugs

 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

 
 
 
 
 
 
 
 
Corrosion  of  ferrous  metals.
One of the most familiar types of corrosion is ferrous oxide,..
 
Corrosion  of  aluminum  and  aluminum  alloys.
Corrosion attack on aluminum surfaces is usually quite obvious,.
 
Corrosion  of  magnesium  alloys.
Magnesium is the most chemically active of the metals used,.
 
Treatment  of  titanium  and  titanium  alloys.

Attack on titanium surfaces is generally difficult to detect

 
Protection  of  dissimilar  metal  contacts.
Certain metals are subject to corrosion when placed in contact with other metals
 
Processes  and  materials  used  in  corrosion  control
Aircraft parts are almost always given some type surface finish
 
Chemical  treatment.
Parco Lubrizing in a chemical treatment for iron and steel parts
 

 

 

Inspection                                                           Corrosion Prone Areas                                                              Corrosion Limits

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