Thread: Pump Bolts Corroding....
05-21-2009, 11:38 AM #1
Pump Bolts Corroding....
The bolts on my pump aren't looking too good. The bolts don't look too bad themselves but while trying to work on the pump today the 4 bolts that go into the pump shoe came out a little rough and 2 of the 4 on the part where the nozzle bolts on snapped trying to get them out.
I'm gonna try to TIG weld some nuts on the broken ones to get them out but What can I do to stop the corrosion from getting any worse?? I'm just glad none of the bolts broke off in the pump shoe at this point but I could see it happening next time.
Just to clarify it seems more like the aluminum that is starting to corrode and stick the bolts than it does the Stainless Bolts.
05-21-2009, 11:42 AM #2
- Join Date
- Jul 2006
05-21-2009, 11:46 AM #3
- Join Date
- May 2005
Part of the problem is that the bolts go all the way thru the aluminum and project past water can seep in from the back and allows junk to form. I usually coat the bolt with never sieze or grease which keeps the aluminum from corroding - I have not had a problem with them coming loose.
05-21-2009, 01:18 PM #4
05-21-2009, 02:00 PM #5
How does your zinc anodes look like on your ride plate and pump housing? If these get wore out, then the process goes much faster.
05-21-2009, 02:57 PM #6
sempen the heads of the bolts....that'll keep it at bay....aluminum and steel together are never a good thing. galvanic corrosion is a b*tch
05-21-2009, 03:11 PM #7
Blue Loctite also serves as an anti-seize and won't wash away if you give it a day to dry before getting it wet. get the bottle that has an ounce or so in it, the tip is long enough to reach all of the internal threads.
05-22-2009, 11:05 AM #8
This should help you out....good tidbits of info on it... it's an aircraft publication but it applies to SkisFigure 3-4) and are in electrical contact.
3-9.2. GALVANIC CORROSION. Galvanic corrosion
occurs when different metals are in contact with each
other and an electrolyte, such as sea water. It is usually
recognizable by the presence of a buildup of corrosion
deposits at the joint between the metals. For example,
aluminum skin panels and stainless steel doublers,
riveted together in an aircraft wing, form a galvanic
couple if moisture and contamination are present.
Figure 3-8 shows galvanic corrosion of magnesium
adjacent to steel fasteners. The potential for galvanic
corrosion is greatest when the two metals are well
separated from each other in the galvanic series (see
3-10.1. ALUMINUM. Aluminum and aluminum alloyspreventive compounds are the main methods
are the most widely used materials for aircraft
construction. In addition to its uses in aircraft structure,
aluminum and aluminum alloys are widely used in
equipment housings, chassis, mounting racks,
supports, frames and electrical connector shells.
Aluminum is highly anodic, as evidenced by its position
in the galvanic series table. It is anodic to most other
metals, and, when in contact with them, galvanic
corrosion of the aluminum will occur. Aluminum alloys
are subject to pitting, intergranular corrosion, and
stress corrosion cracking. In some cases, the corrosion
products of a metal in contact with aluminum are
corrosive to aluminum. However, the formation of a
tightly adhering oxide film offers increased resistance
under mild corrosive conditions. The corrosion product
of aluminum is a white to gray powdery material
(aluminum oxide or hydroxide) which can be removed
by mechanical polishing or brushing with abrasives
(Figure 3-23). Therefore, it is necessary to clean and
protect aluminum and its alloys against corrosion.
Since pure aluminum is more corrosion resistant than
most alloys, aluminum sheet stock is often covered
with a thin layer of nearly pure aluminum called cladding
or alclad. However, in a marine environment, all
aluminum surfaces require protection. Cladding is
easily removed by harsh treatment with abrasives and
tooling, exposing the more corrodible alloy surface.
Chemical conversion coating, paints, and corrosion
STAINLESS or corrosion resistant steels (as they are more properlyare identified by numbers in the AISI 300 Series (e
described) are alloys of iron containing large amounts
of chromium and nickel. Stainless steels are used for
gears, bearings, and high strength bolts, and for
mountings, racks, brackets, and hardware in avionic
systems. The main reason for the existence of stainless
steels is their resistance to corrosion. Stainless steels
are much more resistant to common rusting, chemical
action, and high temperature oxidation than ordinary
steels, due to the formation of an invisible oxide film, or
passive layer, on the surface of these alloys. Corrosion
and heat resistance are the major factors in selecting
stainless steels for a specific application. However, it
should be well understood that stainless steels are not
the cure-all for all corrosion problems, due to service
conditions which can destroy the oxide film on their
surfaces. Stainless steels are susceptible to crevice
corrosion and stress corrosion cracking in moist, salt
laden environments. Exposure to saltwater can cause
pitting. The corrosion product of stainless steel is a
roughened surface with a red, brown, or black stain.
Corrosion treatment of stainless steel should be limited
to cleaning. Stainless steels can cause galvanic
corrosion of almost any other metal with which they are
in contact if proper techniques of sealing and protective
coating are not used. Stainless steels may be magnetic
or non-magnetic. The magnetic steels are identified by
numbers in the American Iron and Steel Institute (AISI)
400 Series (e.g. 410, 430). These steels are not as
corrosion resistant as the non-magnetic steels, which
2-3. PREVENTIVE MAINTENANCE.The two most
important factors in preventing corrosion, and the only
ones which can be controlled by field personnel, are the
removal of the electrolyte and the application of protective
coatings. Since the extent of corrosion depends on the
length of time electrolytes are in contact with metals,
aircraft corrosion can be minimized by frequent washing.
If noncorrosive cleaners are used, the more frequently
a surface is cleaned in a corrosive environment the less
the possibility of corrosive attack. In addition, by
maintaining chemical treatments and paint finishes in
good condition, corrosion can be minimized. The
degradation of non-metallic materials can be minimized
by avoiding the use of unauthorized maintenance
chemicals and procedures. In addition, when repair or
replacement of non-metallic materials is required, only
approved materials shall be used. Dedication to proper
preventive maintenance practices maximizes equipment
05-22-2009, 07:42 PM #9
I just pulled mine today to change the prop and there was a little corrosion on all of the bolts. I cleaned them up and sprayed them with Boeshield which is similar to fluid film and used blue locktite to install them. Then I sprayed everything down with some more Boeshield. You just have to keep after it when riding saltwater.
05-23-2009, 12:52 PM #10
Its common. I just broke two of mine this week even after a little heat. they suck. just replace them with better hardware and try to use some sort of anti-seize product.
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