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Stainless steel surface treatment technique for stainless steel chemical boat

A chemical tanker and surface treatment technology, applied in liquid chemical plating, metal material coating process, coating, etc., can solve problems such as insufficient protection, save valuable time, reduce surface roughness, and improve surface quality Improved effect

Inactive Publication Date: 2007-12-05
徐强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although stainless steel is placed in the air and oxygen will slowly form an oxide film, but the protection of this film is not perfect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1 Yangyang Company, a subsidiary of CSC Nanjing Yangtze River Tanker Group: 3,000-ton stainless steel chemical tanker "Ninghua 417" (the first ship in China) (operating)

[0022] First of all, segmental polishing is carried out according to the following steps: ①The stainless steel plate is welded and assembled to become segments; ②Add the abrasive brown corundum, and use a 3.0KW flat-panel electric hand-push polishing machine for grinding and polishing. The flat-panel electric hand-push polishing machine is driven by a 3.0KW motor to rotate the shaft. There is a cloth wheel on the shaft. The abrasive brown corundum is adhered to the cloth wheel. When the shaft rotates to drive the cloth wheel to rotate at a high speed, it can grind and polish the stainless steel surface. ; ③The welds are polished and closed after each section is assembled into a ship.

[0023] Then spray pickling passivation: (1) pump the pickling passivation solution into the cabin with the QB...

Embodiment 2

[0026] Example 2 China Changjiang Nanjing Changjiang Tanker Group: four 3,000-ton stainless steel chemical tankers "Ninghua 418" (operating), "Ninghua 419" (operating), "Ninghua 420" (under construction), "Ninghua Chemical 421" (under construction)

[0027] The steps of segmental polishing and spray pickling passivation and the preparation of the corrosion inhibitor are the same as in Example 1, and the formula of the pickling passivation solution used is: 2 Add 2.6 liters of pickling passivation solution to the treatment surface, wherein 2.6 liters of pickling passivation solution is made of 325ml of 98% nitric acid, 182ml of 40% hydrofluoric acid, 18ml of corrosion inhibitor, and 15.6ml of citric acid (food grade) , 0.4ml fatty alcohol polyoxyethylene ether (analytical pure) and 2059ml water.

[0028]Use 500 kg of 8.5% sodium hydroxide aqueous solution to absorb the acid mist in the cabin. The sodium hydroxide solution is an aqueous solution mixed with 42.5 kilograms of so...

Embodiment 3

[0029] Example 3 Sinochem International: 3450-ton stainless steel chemical tanker "Yingchun" (operation), 3600-ton "Dujuan" (operation), 3600-ton "Milan" (operation), 3600-ton "Asparagus" (in operation) establish)

[0030] The steps of segmental polishing and spray pickling passivation and the preparation of the corrosion inhibitor are the same as in Example 1, and the formula of the pickling passivation solution used is: 2 Add 2.7 liters of pickling passivation solution to the treatment surface, wherein 2.7 liters of pickling passivation solution is made of 405ml concentration of 98% nitric acid, 216ml concentration of 40% hydrofluoric acid, 21.6ml corrosion inhibitor, 18.9ml citric acid (food grade ), 0.3ml fatty alcohol polyoxyethylene ether (analytical pure) and 2038.2ml water.

[0031] Use 500 kg of 9% sodium hydroxide aqueous solution to absorb the acid mist in the cabin. The sodium hydroxide solution is an aqueous solution mixed with 45 kilograms of solid sodium hydro...

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PUM

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Abstract

The present invention relates to stainless steel surface treating process for chemical cargo ship, and the process includes two parts of sectional polishing and spray pickling and deactivating. The process includes the following steps: welding stainless steel plates to form sections, polishing, healing up to form hull, polishing weld seams, pumping pickling and deactivating liquor with anticorrosive diaphragm pump into compartment, spraying pickling and deactivating liquor to each compartment, pumping out the used pickling and deactivating liquor, absorbing acid mist with alkali solution and washing the compartments with water. The treating process of the present invention can raise the anticorrosive capacity of the chemical cargo ship by over 20 times and increase the service life of chemical cargo ship greatly. The treating process has been performed practically.

Description

technical field [0001] The invention relates to the field of shipbuilding, in particular to a stainless steel surface treatment process for a stainless steel chemical tanker. Background technique [0002] Before 2005, the steel used in the domestic construction of chemical tankers was generally carbon steel, and the cargo compartment was painted with paint, and its anti-corrosion period was at most 3 years. If the type of chemical transported is changed, the inner layer of the cargo compartment needs to be repainted, which is not only expensive and time-consuming, but also the maintenance cost is also high. Therefore, stainless steel is mostly used as the main material in the construction of chemical tankers. [0003] Stainless steel, especially domestic stainless steel, has a rough surface, poor quality, and a large number of defects such as pits and pits; while stainless steel is used in transportation, hoisting, assembly, welding, weld inspection (such as flaw detection, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/06C23C18/18C23C22/40C23G1/08
CPCC23G1/086C23C22/34C23G1/088
Inventor 徐强
Owner 徐强
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