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Corrosion Test of Friction Bolts Part 2

The bolts that were installed and then pulled suffered minor damage in the process. They were bent, scratched and abraded. Even so, this damage did not apparently increase corrosion, in fact the loss in weight of these bolts was actually less than the loss in weight of the new bolts. The plates of both types lost similar amounts of weight. According to theory, galvanized coatings which are not damaged are still protective of the underlying steel because of the electrical potential set up between the zinc and iron which prevents chemical attack of the iron.  This appears to be borne out here and the damage inflicted during installation (and removal) would not appear to be deleterious.

Details:
The bolts were 6' long so they were cut to 24" to fit the corrosion cabinet at the required 30° angle from the horizontal. To ensure cut ends would not affect the test results the cut ends of all the specimens were painted with corrosion resistant paint. The bolts and plates were held in mechanical and electrical contact with each other as they would be in the field to ensure that any electrochemical effects between bolt and plate would approximate the installed condition. This was done with non-conductive glass tubing and rubber bands. The basic test parameters are shown in Table II.

Table II: Test Conditions
  PARAMETER VALUE
  Salt Used Sifto (Special High-Purity)
  Water Used Demineralised By Ion Exchange
  Salt Solution Strength 5.0% By Weight
  Salt Solution Specific Gravity 1.035
  Salt Solution pH, As Prepared 6.0
  Salt Solution pH, Boiled 6.8
  Salt Fog Condensate pH 6.9 - 7.0
  Salt Fog Condensation Rate 1.9 ml per hour
  Tower Temperature 125°F
  Jacket Temperature 95°F
  Cabinet Interior Temperature 36°C

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