FNTS1 can measure non-magnetic coatings applied to ferrous magnetic metals, AND non-conductive coatings applied to non-ferrous metals Is the PosiTector affected by the surface roughness profile of the metal substrate below the coating? All coating thickness gages are influenced to some degree by substrate roughness, as shown in the below image. SSPC-PA 2 proposes several solutions depending upon the instrument type and the particular situation. One option is to verify the gage reads zero on the uncoated steel substrate, and adjust to zero if necessary.
This is a popular solution when the metal surface is relatively smooth. Since it is difficult to ensure that the probe tip is sitting on the highest peaks of the surface profile, another option is to place a plastic shim of a known thickness that is close to the expected thickness of the applied coating between the probe and substrate and adjust to the stated thickness of the shim- referred to as a 1-point adjustment.
This best simulates a coating covering the peaks of the surface profile. Can the PosiTector measure coatings on stainless steel? Others have no magnetic response whatsoever, and some possess a ferromagnetic response similar to carbon steel. The PosiTector is uniquely able to measure partially magnetic stainless steel alloys, an application that is challenging for many competitive instruments.
Can the PosiTector measure coatings on hot surfaces? All PosiTector probe are capable of measuring on hot surfaces. However, if the probe is lifted clear of the surface as soon as a reading is taken and is allowed to cool, measurements can be taken at higher temperatures.
What is the minimum part size required to take a reading? Verify accuracy by measuring a plastic shim placed on the uncoated part. If the measurement is within the combined tolerances of the shim and probe, the probe is suitable for measuring the coated part. Can the PosiTector be used underwater? Hard Anodizing Heat Exchangers Over a number of years, Southwest United Industries in Tulsa, Oklahoma has successfully heated many process chemistries using Thermax2 heat exchangers driven by steam.
Chemfilm Adding Chemfilm Processing to Your Facility If you are thinking about adding a process line to your facility to do chemfilm, most of the articles, classes and information presented by this website are applicable to the chemfilm process, also known as chromate conversion coating or Alodine.
Anodizing Kits Anodizing Kits Many of the people who happen onto one of our websites looking for anodizing or plating equipment are really more interested in very small "anodizing kits" rather than the larger anodizing lines that we usually design and build. How To Anodize Aluminum How to Anodize Aluminum We are often asked for a general description of the process steps to define how to anodize aluminum. City skyline Photo By: John Doe. Blurred Lines Photo by: John Doe.
Let us know your wastewater remediation needs. Contact Us Name:. How May We Help You? Company Name. Thank you for taking the time to visit our website! So what became of Type I, and are there any other processes that are not included in the original distinction? We are here to break them up for you evenly and make them more understandable. This is the oldest type of anodizing, and it forms softer anodized films, much thinner than the regular or hard anodized finishes. Its thinner coated oxide coating is usually expressed in microinches, from 20 to at most.
However, although thin in nature, it still provides equal corrosion protection and wear resistance when properly sealed. This subtype is an alternative to chromic Acid Anodizing, as it bypasses the environmental concerns.
It is covered by MIL-A and mostly used for corrosion protection and paint adhesion. The most common type of anodizing is Type II, or regular anodize. Type II has the most widely applied solution containing sulfuric acid, providing a moderately thick coating. Its porous surface is conducive to color surface finishes on aluminum and aluminum alloys. Prior to anodizing, the products can be treated to achieve a matte look. Sulfuric acid type II anodizing is overall the least expensive process, and it provides a wide variety of anodizing aluminum alloys and is available in many colors.
On top of that, its waste treatment is far easier to control than that of chromic anodizing. Type III anodizing, also known as hard coat anodize, is also achieved with sulfuric acid based electrolyte, but the product is a much thicker, denser aluminum oxide coating. This process is meant for components that are subject to extreme wear or highly corrosive environments. A more durable coating is needed in things like blast shields, hinge mechanisms, valves, and joints.
Type III is applied for enhanced electrical insulation. Etching is a pretreatment process used to achieve a premium visual appeal.
There are two types of etching used to eliminate surface defects. One uses caustic soda, and the other, acid etch, treats the surface with fluoride-based ions and eliminates the imperfections.
The process of sealing is one of the final steps in anodization, and according to many, it is the most important one. Sealing provides maximum corrosion resistance but minimizes abrasion resistance. Three of the most common types of sealing are hot deionized water sealing, mid-temperature sealing, and cold sealing. Types of sealants used vary based on the anodizing process at hand, some of which will require boiling deionized water.
Others, such as those containing dye colored parts, will not require this step. Cold sealing provides the highest quality product but is likely to be slightly more complicated to perform. As you can see, anodizing has an incredibly wide application throughout many industries. The process can vary in its complexity and cost, but the final product performs and looks better than the original component, by far. From the small business owner of a key shop to companies developing parts for military-grade aircraft carriers , many can benefit from using anodized components.
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