Tor Arthur Andreasen has an extensive experience with taking care of the objects that were recovered from seawater. Having had the leadership of efforts to raise the Heinkel He 115, He has also preserved some parts belonging to the plane.
Storage of parts
It is in the diving community is a common practice to store sjøobjekter in glycol. This anticipating that one can begin to work with the parts.
It is their experience that the glycol has a number of useful properties that make it usable for such use. Glycol has among others. kapillaregenskaper comparable to water. It will therefore relatively quickly pull into the joints. Where it helps to dilute any salt concentrations. Glycol has a high affinity to water, but not evaporate. A reduced evaporation of moisture from a joining, To reduce further the concentration of any corrosive compounds. Over time, the osmosis process do that any salt or acid concentrations migrate through the glycol.
They also have good experiences with the threaded connections held moist using glycol, not stick. They also have good experiences with lacquered objects, which has been several years in the glycol, without this seems to have damaged the paintwork. In contrast, they found that some that some rubbers are soft when stored in glycol.
When the part is ready for further work washed glycol single away using freshwater.
Removal of parts
The next step in preservation is to dismantle an object, as far as practicable, without causing detriment.
Removal of corrosion products
To dissolve corrosion products, they have had as a common practice to add parts of an acid in about. 15 minutes. The type of acid used is again dependent on the form of corrosion products as a wish to remove.
Is the material aluminum they use frequently 85 % acetic acid. This acid is unfortunately very illeluktende-, alternatively bellies they 30 % citric acid solution.
Cooler cleaner is a kind rust fixes. It is produced by DPI, and consists of approximately. 30 % citric acid. It is typically used in a 10- 50 % mix. One advantage with this product is that it dissolves rusty so it is not precipitated elsewhere, and that the material does not rust on while it is in the acid, such that the metal remains glossy finishing.
Is the paint or varnish that one would want to take care of, used often 10 % oksalsyre. This is a kind acid which still functions well in removing rust and various deposits.
The choice of acid will also depend on the type of corrosion products as a want removed. If one wants to remove lime can choose a slightly brutal treatment in a strong acid, like for example. 50 % fosforsyre. This will effectively remove limescale, and generally will not harm metal appreciable. But it is important that one right after the acid treatment is careful to wash away all acid residues.
To wash off the acid remaining after the treatment in the acid bath is often used in the diving environment a product called Blue Gold. This is a product that is kind to aluminum.
The acids used are water soluble and mixes with corrosion products.
Removal of salt
After the process of removing corrosion products are finished, practice they often boil parts 1 hour in water. This is to help reduce the amount of residual salts left in the material.
Evaporation of moisture
After you are finished with the acid is the next step to get vaporized whatever might be of moisture in the material. This is often done by heating section up to 120 ° Celsius. In this temperuren is part of ca. 1 time.
preservative products
The final step is to apply the part surfaces a preservative product. Here the divers often beeswax, alternatively a gun oil, Lanolin or another oil with good preservative properties.
Conservation of parts from Heinkel He 115
Tor Arthur has preserved finishing a Walther flare gun and a badge from one wing root.
- Signal pistol finished conserved
Signal gun was first stored in glycol, then disassembled and washed in 85 % acetic acid / 30 % citric acid. The parts were then boiled in water for about
. 1 time, and then dried in an oven at 120 ° C for 1 time. It was finally inserted with a weapon oil, and returned to the museum.
- Signs vingerot finished conserved
Follow signs from the wing root has some corrosion damage. First, this stored glycol
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. It was then placed in a 85 % acetic acid for about. 15- 20 minutes to be washed away corrosion products. To reduce the amount of salt remaining in the material, it was then boiled in water for about. 1 time. The sign was then heated to approximately. 120° c i ca. 1 hours for drying of the residual moisture. Finally, it was dipped in liquid beeswax, and handed back to the project.
Down below you can see a picture of an aluminum part that is cleaned with acid, boiled in fresh water, dried 120 degrees and then preserved with liquid beeswax.
An aluminum part which is taken up from the sea. The part is rinsed with acid, boiled in fresh water, dried 120 degrees and then preserved with liquid beeswax.
The next picture shows a similar aluminum part like the one pictured above. This section has been stored dry, and is not given the same treatment as the corresponding part of the image above.
An aluminum part corresponding to the previous image. This section has been left dry for two years without having been treated by the above of said preservation process.