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Iron-based sacrificial anode for protecting non-magnetic stainless steel and stainless steel drill collar

A non-magnetic stainless steel, sacrificial anode technology, applied in the field of anti-corrosion, can solve the problems of not forming mature sacrificial anode grades and the performance of sacrificial anodes are quite different, and achieve the effect of reducing short life, easy to fall off, and improving current efficiency

Inactive Publication Date: 2015-06-10
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, there is little research on iron-based sacrificial anodes, and no mature sacrificial anode grades have been formed. In actual use, pure iron or ordinary carbon steel is mostly used, and the performance of sacrificial anodes of these materials is quite different.

Method used

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  • Iron-based sacrificial anode for protecting non-magnetic stainless steel and stainless steel drill collar
  • Iron-based sacrificial anode for protecting non-magnetic stainless steel and stainless steel drill collar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This implementation takes four iron-based sacrificial anode materials to protect 310S non-magnetic stainless steel as an example. 310S is a commonly used non-magnetic stainless steel with high Cr and Ni content: C is 0.06%, Cr is 25%, and Ni is 20%. , Mn is 2%. Table 2 shows the performance indicators of sacrificial anodes tested by the national standard GB / T 17848-1999 method.

[0030] Table 2 Electrochemical performance of four kinds of iron-based sacrificial anodes when protecting 310S

[0031]

[0032]

[0033] The test results show that the working potential of alloy steel 3 is stable, the current efficiency is the highest, the surface of the sample is corroded uniformly, and the corrosion products are easy to fall off.

[0034] According to the experimental results, the role of alloying elements in the sacrificial anode is summarized: the C content should not be too high, otherwise the conductivity of the alloy will be reduced, and the current efficiency of...

Embodiment 2

[0036] This implementation takes alloy steel 3 as an example to protect F166 non-magnetic stainless steel. F166 is a commonly used non-magnetic stainless steel with high Cr and Mn. The composition is 0.05% of C, 18% of Cr, 18% of Mn, and 0.8%, Mo is 0.8%. The performance of the sacrificial anode tested by the national standard GB / T 17848-1999 method is: open circuit potential -0.6295V, working potential -0.61~-0.62V, actual capacitance 944.4A·h / kg, current efficiency 98.4%. The test results show that when alloy steel 3 protects F166 non-magnetic stainless steel, the working potential is stable, the current efficiency is high, the surface of the sample is corroded uniformly, the corrosion products are easy to fall off, and it has excellent sacrificial anode performance.

Embodiment 3

[0038]In this implementation, alloy steel 3 is used to protect P550 non-magnetic stainless steel as an example. P550 is also a commonly used non-magnetic stainless steel with high Cr and Mn. The composition is 0.04% of C, 20% of Cr, 18% of Mn, and 3.0%, Mo is 3.0%. Using the national standard GB / T 17848-1999 method to test the performance of the sacrificial anode is: open circuit potential -0.6315V, working potential -0.62~-0.63V, actual capacitance 913.0%, current efficiency 95.1%. The test results show that when alloy steel 3 protects P550 non-magnetic stainless steel, the working potential is stable, the current efficiency is high, the surface of the sample is corroded uniformly, the corrosion products are easy to fall off, and it also has excellent sacrificial anode performance.

[0039] The 3 components of alloy steel selected here can be extended to a more suitable composition range according to several test times: C is 0.15-0.20wt%, Mn is 0.5-0.85wt%, Cr is 0.8-1.25wt%,...

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Abstract

The invention discloses an iron-based sacrificial anode for protecting non-magnetic stainless steel and a stainless steel drill collar. The iron-based sacrificial anode comprises the following components: 0.15-0.20wt% of C, 0.5-0.85wt% of Mn, 0.8-1.25wt% of Cr, 0.20-0.30wt% of Si, 0.05-0.12wt% of Ti and the balance of Fe. The iron-based sacrificial anode is assembled on the non-magnetic stainless steel to be protected, and the iron-based sacrificial anode and the non-magnetic stainless steel to be protected are in full contact with each other, so that the current efficiency is improved; and meanwhile, the phenomena of short service life and low efficiency caused by shedding of the sacrificial anode can also reduced. The iron-based sacrificial anode disclosed by the invention has very high current efficiency, can be uniformly dissolved, corrosion product is easy to fall out. The iron-based sacrificial anode disclosed by the invention is an excellent sacrificial anode for protecting the non-magnetic stainless steel.

Description

technical field [0001] The invention belongs to the field of anti-corrosion technology, and more specifically relates to an iron-based sacrificial anode and a stainless steel drill collar for protecting non-magnetic stainless steel. Background technique [0002] The oil drilling industry occupies an important position in the national economy, and the core of drilling technology lies in downhole drilling equipment and mud logging equipment. With the widespread use of drilling equipment, the efficiency of downhole drilling has been greatly improved. But at the same time, facing the complex corrosion environment downhole, the corrosion of drilling equipment has become an urgent problem to be solved. The main body of the drilling equipment in the downhole is a non-magnetic drill collar. At present, the non-magnetic drill collar commonly used in China is mainly made of high Cr, Ni or high Cr, Mn stainless steel, which has good corrosion resistance. However, with the prolongatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F13/14C22C38/28
Inventor 丁冬雁田璇
Owner SHANGHAI JIAO TONG UNIV
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