Fluid-handling apparatus with corrosion-erosion coating and method of making same

a technology of corrosive corrosion and coating, which is applied in the direction of coatings, lighting and heating apparatus, corrosion prevention, etc., can solve the problems of affecting the performance of the cooling devi

Inactive Publication Date: 2006-06-15
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using sea water as the coolant can present a challenge due to the sea water's corrosive nature and tendency to contain abrasives such as sand and silt and other forms of deposits including sea weeds, sea shell fragments, animal components, etc.
Due to the high velocity and the corrosive nature of the sea water, the sea water contacting the inlet surfaces will impinge the surfaces.
The impingement can cause corrosion and erosion, and thus, damage the surfaces of the inlet manifold, including a core surface defining inlets of the sea water passages.
Over time, the damage can lead to holes, causing leakage of the sea water and, thus, premature failure of the heat exchanger.
For instance, the corrosion and erosion can create holes in the surfaces separating the hot air passages and the ...

Method used

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  • Fluid-handling apparatus with corrosion-erosion coating and method of making same
  • Fluid-handling apparatus with corrosion-erosion coating and method of making same
  • Fluid-handling apparatus with corrosion-erosion coating and method of making same

Examples

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example coating 2

[0024] Example coating 2 includes a copper-nickel alloy that includes approximately 70% copper and approximately 30% nickel. Those skilled in the art will appreciate that example coating 2 is a commercially available alloy, specifically alloy 71600, often referred to as 70-30% copper-nickel. Similar to example coating 1, in addition to the copper and nickel, example coating 2 includes other alloying metals, including iron and manganese. Example coating 2 is harder than the corrosion-erosion prone surfaces 43a upon which the coating 40 is applied. Example coating 3 includes a 60% copper—40% nickel alloy. Example coating 3 is not a standard copper alloy, but rather a powder commercially available for physical disposition spray applications. Although coating 3 could include other minor alloying metals like those used in example 1 and example 2, coating 3 is illustrated as including 60% copper and 40% nickel. Although the coatings in examples 2 and 3 will protect the corrosion-erosion p...

example coating 4

[0025] Example coating 4 includes a 85-15% copper nickel alloy. Similar to example coatings 1-3, example coating 4 includes copper to transfer the heat between the air and the sea water, and nickel to resist impingement, thereby, providing corrosion and erosion resistance. Moreover, example coating 4 includes minor alloying metals and is commercially available as alloy 72200.

example coating 5

[0026] Example coating 5 includes an aluminum-bronze alloy that includes 14% or less aluminum, 2% or less manganese, 6% or less nickel, and 5% or less iron. The remaining concentration would include copper and / or other minor alloying elements. Those skilled in the art will appreciate that the example coating 5 could includes standard aluminum-bronze alloys commercially available could be used. Example coating 5 is a commercially available aluminum bronze alloy, being alloy 63000. The aluminum aids in corrosion resistance while the iron and nickel aids in impingement resistance. As with the other coatings 40a-c, example coating 5 preferably includes manganese and iron.

INDUSTRIAL APPLICABILITY

[0027] Referring to FIGS. 1-3, a method of making the heat exchanger 14 will be discussed. Although the heat exchanger 14 is part of the engine system 10 with marine application and is a “bar and plate” type heat exchanger, those skilled in the art should appreciate that the method of the presen...

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Abstract

Inlet surfaces of a fluid-handling apparatus, such as a heat exchanger, are often prone to corrosion and erosion due to the high velocities of incoming fluid. The present disclosure includes a fluid-handling apparatus with a plurality of wetted surfaces of which a first portion is corrosion-erosion prone and a second portion is non-corrosion-erosion prone. The first portion is coated with a corrosion-erosion coating that is harder than the first portion. Less than all of the wetted surfaces are coated.

Description

TECHNICAL FIELD [0001] The present invention relates generally to fluid-handling apparatuses, and more specifically to heat exchangers with a corrosive-erosion resistant coating and a method of making same. BACKGROUND [0002] There are various uses for heat exchangers known in the art. For instance, heat exchangers, often referred to as charge air coolers, use a coolant to cool compressed air exiting a turbocharger before the air is injected into an engine. In commercial or pleasure marine crafts, sea water is often used as the coolant. The sea water will flow into a sea water inlet manifold before flowing into a plurality of sea water passages, and the air will flow into an air inlet manifold before flowing into a plurality of air passages. The sea water passages are generally oriented perpendicularly to the air passages such that the heat within the air can be exchanged with sea water through walls of the sea water and the air passages. The sea water passages and the air passages a...

Claims

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Application Information

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IPC IPC(8): F28F19/02
CPCF28D9/0062F28F19/06F28F21/085
Inventor ABI-AKAR, HINDSCOLTON, CHRIS
Owner CATERPILLAR INC
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