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Acid washing purifying plaste special for overheating oxidizing area of OCr18Ni9 storage tank

A technology of 0cr18ni9 and oxidation zone, which is applied in the field of additives, can solve the problems of poor passivation effect and high cost, and achieve the effect of low cost, good effect and reduced construction procedures

Inactive Publication Date: 2006-06-28
大庆油田建设集团
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the existing pickling passivation paste for stainless steel superheated oxidation zone passivation effect is poor, the deficiency of high cost, provide a kind of pickling passivation paste special for OCr18Ni9 storage tank, this passivation paste has strong pertinence, Good performance, easy to clean and apply and low price, and make it easy to clean in dry conditions, which solves the problem of pickling passivation of OCr18Ni9 storage tanks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1. After mixing 20 kilograms of pure nitric acid, 5 kilograms of pure hydrofluoric acid, 0.03 kilograms of LAN-826 corrosion inhibitor and 74.97 kilograms of water, the mixture was then adjusted into a paste with talc powder and bentonite to make it easy The overheated oxidation zone of the OCr18Ni9 storage tank is passivated.

Embodiment 2

[0015] Example 2. After mixing 22.5 kg of pure nitric acid, 6 kg of pure hydrofluoric acid, 0.03 kg of LAN-826 corrosion inhibitor and 71.47 kg of water, the mixture was then mixed with talcum powder and bentonite to make it easy to paste The overheated oxidation zone of the OCr18Ni9 storage tank is passivated.

Embodiment 3

[0016] Example 3. After mixing 25.0 kg of pure nitric acid, 10 kg of pure hydrofluoric acid, 0.03 kg of LAN-826 corrosion inhibitor and 64.97 kg of water, the mixture was then mixed with talc powder and bentonite to make it easy to paste The overheated oxidation zone of the OCr18Ni9 storage tank is passivated.

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PUM

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Abstract

The invention relates to over thermal oxidation area special acid cleaning inactivation paste of 0Cr18Ni9 storage tank. It solves the defect of bad inactivation effect and high cost of current technique. Its feature is that the each component mass percent is as follows: 20.0%-25.0% pure nitric acid, 5%-10% pure hydrofluoric acid, 0.03%LAN-826 corrosion inhibitor, and 65.0%-75.0% water. The inactivation paste has good pertinence and performance and price. It is convenient for cleaning and coating. And it solves the acid cleaning inactivation problem of 0Cr18Ni9 storage tank over thermal oxidation area.

Description

Technical field: [0001] The invention relates to an auxiliary agent used in the field of oil fields, in particular to a special pickling passivation paste for the superheated oxidation zone of an OCr18Ni9 storage tank. Background technique: [0002] There are various types of pickling and passivation products for surface treatment of stainless steel, and various formulas of pickling liquid, passivation liquid, and liquid or paste integrating pickling and passivation have appeared. Liquid pickling and passivation solutions are suitable for soaking all kinds of loose parts and small components. For large storage tanks, only pastes can be used for treatment. However, the existing formed pickling passivation paste products are poorly targeted, and adjust different polluted and oxidized areas by simple water dilution methods, which often cause unnecessary waste or fail to achieve the desired effect; to ensure passivation Effective, and when the passivation time is prolonged, the pickl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/02C23G1/04C23G1/08
CPCC23G1/025
Inventor 王华北郭凤林王宏红李杰春全海涛刘永庆
Owner 大庆油田建设集团
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