REPORT

This report is an archived publication and may contain dated technical, contact, and link information

Top
< Prev
Main
3
4
5
6
7
8
9
10
11
12
Next >
>>

Publication Number: FHWA-HRT-11-062 Date: November 2011

Publication Number: FHWA-HRT-11-062
Date: November 2011

Improved Corrosion-Resistant Steel for Highway Bridge Construction

APPENDIX C. CORROSION PRODUCTS ON CCT COUPONS

The rust location codes for corrosion products on CCT coupons are as follows:

DA: Rust from downward-facing coupon surface.
DAU: Rust from under the course rust from all downward-facing surfaces.
DT: Rust from the top part of the downward-facing surface.
UA: Rust from upward-facing coupon surface.
UAF: Fine rust from all upward-facing surfaces.
UAU: Rust from under the course rust from all upward-facing surfaces.
UB: Rust from bottom part of the upward-facing surface.
UTU: Rust from top part of the upward-facing surface.

Table 28. Rust percentage after 10 cycles of 5 percent NaCl.

Steel	Temp. (ºF)	Coupon Code	Rust Location	Rust Size	Akaganeite	Maghemite	Goethite	Lepidocrocite	NaCl
11Cr	1,350	77AA	UA	nd	86.9	0	2	3	8.1
11Cr	1,200	77YA	UA	nd	77	9	2	3	9
9Cr	1,350	68AA	UA	nd	74.7	12.1	4	5.1	4
9Cr2Si	1,200	71BA	UA	Fine	77.2	11.9	3	4	4
9Cr2Si	1,200	73BA	UA	Coarse	50	31	9	10	0
9Cr2Si	1,200	73BA	UA	Fine	78	12	2	4	4
9Cr2Si	1,350	71AA	UA	Fine	68.3	17.8	4	5	5
7Cr2Si	1,350	73AA	UA	Coarse	48.5	31.3	9.1	11.1	0
7Cr2Si	1,350	73AA	UA	Fine	79.8	11.1	2	4	3
7Cr2Al	1,200	75AA	UA	Fine	75.8	13.1	2	4	5.1
7Cr2Al	1,200	75AA	UA	Coarse	43.6	32.7	10.9	9.9	3
5Cr2Si2Al	1,200	80BA	UA	Coarse	43	33	11	13	0
5Cr2Si2Al	1,200	80BA	UA	Fine	79.2	9.9	2	4	5
°C = (°F-32)/1.8 nd = Not determined

Table 29. Rust percentage after 20 cycles of 5 percent NaCl.

Steel	Temp. (ºF)	Coupon Code	Rust Location	Akaganeite	Maghemite	Goethite	Lepidocrocite	NaCl
ASTM A1010	nd	D15	UA	81.8	10.1	2	4	2
11Cr	1,200	77YF	UA	61	12	4	5	18
11Cr	1,350	77AH	UA	58.6	13.1	5.1	6.1	17.2
9Cr	1,350	68AH	UA	35.6	40.6	11.9	8.9	3
9Cr2Si	1,200	71BD	UA	38.4	37.4	11.1	13.1	0
9Cr2Si	1,350	71AD	UA	36	41	11	12	0
7Cr2Si	1,200	73BF	UA	31	44	11	14	0
7Cr2Si	1,350	73AF	UA	28	47	12	13	0
7Cr2Al	1,200	75AF	UB	26	47	16	11	0
5Cr2Si2Al	1,200	80BF	UT	30	42	12	16	0
°C = (°F-32)/1.8 nd = Not determined

Table 30. Rust percentage after 40 cycles of 5 percent NaCl.

Steel	Temp. (ºF)	Coupon Code	Rust Location	Rust Size	Akaganeite	Maghemite	Goethite	Lepidocrocite	NaCl
ASTM A1010	nd	D21	UA	nd	68	16	7	7	2
11Cr	1,200	77YI	UA	Fine	62	21	7	6	4
11Cr	1,350	77AI	UA	Fine	51.5	25.7	11.9	8.9	2
9Cr	1,350	68AI	UA	Fine	44	35	8	8	5
9Cr2Si	1,200	71YA	UA	Fine	52	29	7	8	4
9Cr2Si	1,350	71AI	UA	nd	31	39	14	16	0
9Cr2Si	1,350	71AI	UA	Fine	44	36	8	8	4
7Cr2Si	1,200	73BJ	UA	Fine	55	27	4	3	6
7Cr2Si	1,350	73AJ	UA	Fine	69.3	21.8	3	5.9	0
7Cr2Al	1,200	75BB	UA	nd	32.3	39.4	15.2	11.1	2
5Cr2Si2Al	1,200	80BI	UA	nd	49.5	31.7	7.9	6.9	4
5Cr2Si2Al	1,200	80BI	UA	Fine	64	23	4	4	5
°C = (°F-32)/1.8 nd = Not determined

Table 31. Rust percentage after 70 cycles of 5 percent NaCl.

Steel	Temp. (ºF)	Coupon Code	Rust Location	Akaganeite	Maghemite	Goethite	Lepidocrocite	Iron(II) Chloride Tetrahydrate	NaCl
ASTM A1010	nd	D23	UA	40.6	27.7	10.9	10.9	6.9	3
11Cr	1,200	77YL	UA	51	25	13	11	0	0
11Cr	1,350	77AL	UA	34	35	16	11	0	4
9Cr	1,350	68AL	UA	26.7	34.7	18.8	18.8	0	1
9Cr2Si	1,200	71YD	UT	31.7	42.6	12.9	12.9	0	0
9Cr2Si	1,350	71AN	UT	32	44	13	11	0	0
7Cr2Si	1,200	73YB	UA	59.6	18.2	4	0	18.2	nd
7Cr2Si	1,200	73YB	UT	21	60	14	5	0	0
7Cr2Si	1,200	73YA	UT	29	54	9	8	0	0
7Cr2Si	1,350	73AL	UT	28	53	11	8	0	0
7Cr2Si	1,350	73AL	UAU	59	24	6	10	0	1
7Cr2Al	1,200	75BF	UA	22	39	19	19	0	1
7Cr2Al	1,200	75BF	UA	24	38	19	19	0	0
5Cr2Si2Al	1,200	80YA	DAU	55	34	7	4	0	0
5Cr2Si2Al	1,200	80BL	UAU	58	18	5	0	19	0
ASTM A588	70	504	UT	14	75	8	3	0	0
ASTM A588	70	504	UB	14	0	0	0	86	0
ASTM A588	70	504	UAU	29.7	10.9	2	0	57.4	0
°C = (°F-32)/1.8 nd = Not determined

Table 32. Rust percentage after 100 cycles in 5 percent NaCl.

Steels	Temp. (ºF)	Coupon Code	Rust Location	Rust Size	Akaganeite	Maghemite	Goethite	Lepidocrocite	NaCl
ASTM A1010	nd	D25	UB	nd	23.2	43.4	15.2	11.1	7.1
ASTM A1010	nd	D25	UT	nd	36	33	14	17	0
ASTM A1010	nd	D25	DT	nd	53	23	9	10	5
11Cr	1,200	77BD	UT	nd	34	32	19	14	1
11Cr	1,350	77AP	UT	nd	42.4	28.3	15.2	13.1	1
9Cr2Si	1,350	71AO	UAU	Fine	47	41	6	6	0
9Cr2Si	1,350	71AO	UAU	Coarse	41	37	10	12	0
7Cr2Si	1,200	73YI	UAU	Coarse	59.4	29.7	5	5	1
7Cr2Si	1,200	73YI	UAU	Fine	74	23	3	0	0
7Cr2Si	1,350	73AO	UTU	Fine	61	30	4	5	0
7Cr2Si	1,350	73AO	UTU	Coarse	50.5	37.6	5	5.9	1
7Cr2Al	1,200	75BL	UAU	Fine	51	30	7	6	6
7Cr2Al	1,200	75BL	UAU	Coarse	33	42	12	11	2
7Cr2Al	1,200	75BL	UA	nd	26	38	17	19	0
5Cr2Si2Al	1,200	80YC	UTU	Coarse	63	24	13	0	0
5Cr2Si2Al	1,200	80YC	UTU	Fine	71	16	13	0	0
ASTM A588	nd	501	UA	nd	53.5	36.6	5	4	1
°C = (°F-32)/1.8 nd = Not determined

Page Owner: Office of Research, Development, and Technology, Office of Infrastructure, RDT

Topics: research, infrastructure, structures
Keywords: research, structures, Stainless steel, Bridges, Corrosion resistance, Atmospheric corrosion, Steel, Cyclic corrosion test, Maghemite, A1010
TRT Terms: research, infrastructure, Facilities, Structures
Scheduled Update: Archive - No Update needed

This page last modified on 01/11/2012