Risk of seawater corrosion to the bolt hole and screw?
Risk of seawater corrosion to the bolt hole and screw?
(OP)
An equipment made of carbon steel will be used about 30 meters under seawater. The wetted surfaces are coated and cathodically protected.
Bolts are used to connect a cap into the body. The bolts heads are exposed to seawater. One concern is that the seawater can get into bolt hole through the mating surfaces and may cause corrosion to the bolt hole and scew.
Anyone can tell me if this risk is high and how to provent it? Thanks a lot.
Bolts are used to connect a cap into the body. The bolts heads are exposed to seawater. One concern is that the seawater can get into bolt hole through the mating surfaces and may cause corrosion to the bolt hole and scew.
Anyone can tell me if this risk is high and how to provent it? Thanks a lot.





RE: Risk of seawater corrosion to the bolt hole and screw?
RE: Risk of seawater corrosion to the bolt hole and screw?
Can you introduce more about this corrosion mechnism and how to select Pro-seal sealant?
RE: Risk of seawater corrosion to the bolt hole and screw?
RE: Risk of seawater corrosion to the bolt hole and screw?
RE: Risk of seawater corrosion to the bolt hole and screw?
RE: Risk of seawater corrosion to the bolt hole and screw?
We have seen a number of failures of bolting materials with hardness in excess of 35 Rockwell C (HRC). 35 HRC should be specified as a maximmum for all steel bolting materials. (No Grade 8 bolts, no ASTM A 574 socket head cap screws, etc.)
Beyond that, the combination of cathodic protection and coating should be sufficient to prevent general corrosion. A good thread compound is helpful for reasons other than corrosion control.
mburns@metallurgical.com