![]() ![]() During corrosion at a particular spot on the surface of an object made of iron, oxidation takes place and that spot behaves as an anode. The chemistry of corrosion is complex it can be considered an electrochemical phenomenon. However, some corrosion mechanisms are less visible and less predictable. As a result, methods to reduce the activity of the exposed surface, such as passivation and chromate conversion, can increase a material's corrosion resistance. Because corrosion is a diffusion-controlled process, it occurs on exposed surfaces. Corrosion can be concentrated locally to form a pit or crack, or it can extend across a wide area more or less uniformly corroding the surface. Many structural alloys corrode merely from exposure to moisture in air, but the process can be strongly affected by exposure to certain substances. Corrosion degrades the useful properties of materials and structures including strength, appearance and permeability to liquids and gases. Corrosion can also occur in materials other than metals, such as ceramics or polymers, although in this context, the term "degradation" is more common. This type of damage typically produces oxide(s) or salt(s) of the original metal and results in a distinctive orange colouration. Rusting, the formation of iron oxides, is a well-known example of electrochemical corrosion. In the most common use of the word, this means electrochemical oxidation of metal in reaction with an oxidant such as oxygen, hydrogen or hydroxide. Corrosion engineering is the field dedicated to controlling and preventing corrosion. It is the gradual destruction of materials (usually a metal) by chemical or electrochemical reaction with their environment. There's also the possibility of using the locking nut that came with the switch, but attempting to get it threaded onto the switch threads deep inside that hole would require more patience and a steadier hand than I possess.Corrosion is a natural process that converts a refined metal into a more chemically stable oxide. ![]() You'll need something there to prevent the switch from spinning, but maybe something like plumbers putty pressed firmly into place would work and still be removable later. If you use epoxy, let it dry overnight.Īttention: If you ever want to be able to disassemble the valve, omit the epoxy or glue on the wire side of the switch. Be careful to not put so much in, or tip the valve, so that anything gets into the upper valve area. Go ahead and attach the handle onto the stem at this point and hold the wires in place so the whole switch isn't trying to rotate inside the valve.ĭrip hot glue or use your screwdriver to spread some epoxy inside the valve where the wires come out to prevent the knob from spinning inside the valve and causing the wires to twist. With the switch and stem in place, thread the bonnet nut on far enough to hold, but not so far that it starts to bind on the knob. Dremel with a brass brush or something else that can smooth burrs from drilling.Hot glue gun or epoxy (JB Weld recommended).Drill press and bits suitable for brass, or some other way to remove threads from inside a piece (step 6).A vice will be helpful in removing the bonnet nut.Adjustable wrench or several sizes of box wrenches.Test other brands to see if they fit together as well. This switch fits inside this valve almost perfectly. If you don't mind using a 3/4" valve, it will all fit much easier, but might need some epoxy holding everything in place. You need the kind pictured in the cutaway where the water enters, goes through a vertical hole and out the other side. As I write this, I can't find either on the Lowes website, but I know they are a typically stocked item. The water valve was a stocked item at a local Ace Hardware for about $9 but Lowes has them too. It cycles through on/off in a clockwise direction each quarter turn. This switch can handle 3 amps at 120V or 5 amps at 12V. I later saw that Lowes has a very similar switch that appears to be the same size for just over $3. ![]() I found the switch at and picked it up at a local facility near me for $6.25. For my water valve light switch I used a Mueller Industries, Proline 1/2" shut off valve (105-003NL) and a Carling Technologies R-135-BL rotary switch.
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